CWUIC · California Wildland-Urban Interface Code
Minimum specifications for width, grade, turning radius and clearances for apparatus roads
For new subdivisions and structures in the wildland‑urban interface the CWUIC requires approved fire apparatus access roads built to specific minimums: typically two 10‑ft lanes (20 ft clear), driveways at least one 10‑ft lane with 14 ft horizontal and 13 ft‑6 in vertical clearance, grades not exceeding 16% (20% only with approval), minimum curve radii and added width on tight curves, required turnouts and turnarounds (40 ft turning radius; hammerhead/T dimensions), and roads/bridges capable of supporting specified apparatus loads. All requirements are grounded in CWUIC Section 402.1.1 and the access/grade provisions referenced in Section 403 (see the reproduced Title 14 CCR 1273.xx text in the CWUIC excerpts).
Last reviewed: July 6, 2026
What the code requires — plain English
The CWUIC requires that new subdivisions and individual structures be provided with approved fire apparatus access roads and that those roads meet minimum width, grade, turning-radius and clearance dimensions so emergency apparatus can reach and operate at the scene. The subdivision access requirement is set out in § 402.1.1 and the detailed access/road specifications are in the access chapter (see § 403.3) and the grading requirements (see § 403.7). The CWUIC reproduces the Title 14 (CCR) dimensions for lanes, driveways, vertical clearance, turnarounds, curve radii and turnouts that local plan reviewers and field inspectors use to verify compliance.
Ensure an approved fire apparatus access road reaches the building or subdivision and provides the minimum widths, grade limits, turning area and vertical/horizontal clearances required so fire apparatus (up to the specified loads) can arrive, turn and operate safely and reliably.
Requirements in detail
Notes:
- Bolded items below are defined terms, required thresholds, or controlling sections on first mention.
- Where CWUIC reproduces Title 14 CCR sections, I cite the CWUIC/CCR text captured in the provided files.
Key minimum dimensions (at a glance)
| Item | Minimum dimension / value | Code Reference |
|---|---|---|
| Minimum two-way road width (two traffic lanes) | Two 10‑ft traffic lanes = 20 ft, exclusive of shoulders/striping | CWUIC §403.1.2 (Title 14 §1273.01) |
| One‑way road lane (approved by local jurisdiction) | One 12‑ft traffic lane | CWUIC §403.1.2 (Title 14 §1273.01) |
| Driveway lane | One 10‑ft traffic lane (also 14 ft unobstructed horizontal clearance; 13 ft‑6 in vertical clearance) | CWUIC §403.1.2 (Title 14 §1273.01) |
| Unobstructed vertical clearance (roads/driveways/gates) | 13 ft‑6 in | CWUIC §403.1.2 (references California Vehicle Code 35250) and gate provisions |
| Road structural load | Roads: support fire apparatus weighing 75,000 lb; bridges/structures per AASHTO HB‑17 | CWUIC §403.1.3 (Title 14 §1273.02) and §403.1.8 |
| Maximum running grade | 16% maximum (may exceed up to 20% with local‑jurisdiction approval and mitigation) | CWUIC §403.1.4 (Title 14 §1273.03) |
| Minimum horizontal inside radius (curves) | 50 ft inside radius; add +4 ft surface width for curves radius 50–100 ft, +2 ft for 100–200 ft | CWUIC §403.1.5 (Title 14 §1273.04) |
| Turnaround minimum turning radius | 40 ft minimum turning radius for turnarounds (not including parking). Hammerhead/T top length: 60 ft minimum. | CWUIC §403.1.6 (Title 14 §1273.05) |
| Turnouts (for passing) | 12 ft wide × 30 ft long with 25 ft taper on each end | CWUIC §403.1.7 (Title 14 §1273.06) |
| Dead-end road turnarounds & lengths | Dead-end road maximum cumulative lengths and turnaround spacing are given by parcel size; turnarounds required for many dead‑end lengths (see text). | CWUIC §403.1.9 and §403.1.6 (Title 14 §§1273.08 & 1273.05) |
| Fire Code Appendix D (supplementary) | Appendix D (Fire Code) gives additional minimums (e.g., where hydrants on access roads min road width 26 ft; Table D103.4 width/turnaround requirements by dead‑end length). | California Fire Code Appendix D (D103.1, D103.4) reproduced in CWUIC files |
Notes on references: CWUIC §403 (access) reproduces and cross‑references Title 14 CCR provisions (1273.xx) — the file excerpts above show the specific lane, clearance, grade and turnaround dimensions used by local authorities.
Width & lanes (detailed)
- All Roads (two‑way): must provide two 10‑ft traffic lanes (total 20 ft clear, not counting shoulders or striping). Vertical clearance to follow vehicle code requirements. § 403.3 / § 403.1.2 (CCR Title 14 §1273.01)
- Authorized one‑way roads: may be approved by the local jurisdiction but must be 12 ft lane width and meet connection/length restrictions (connect at both ends to two‑lane roads; not more than 2,640 ft in length; turnout at midpoint). § 403.3 / § 403.1.2
- Driveways: 10‑ft traffic lane minimum, 14‑ft unobstructed horizontal clearance, 13 ft‑6 in vertical clearance. § 403.3 / § 403.1.2
Grade (detailed)
- Maximum grade: 16% (no point on a road/driveway shall exceed 16%). Local jurisdictions may allow grades up to 20% with approval and mitigation to provide the same practical effect. These are the CWUIC/CCR Title 14 grade caps referenced under § 403.7 in the CWUIC index.
Turning radius, curves and turnarounds
- Minimum horizontal inside radius (curves): 50 ft. Curves between 50–100 ft radius require +4 ft of additional surface width; curves 100–200 ft radius require +2 ft added surface width. § 403.3 / § 403.1.5
- Turnarounds: required for driveways and dead‑end roads. Minimum turning radius 40 ft for a turnaround (excluding parking). If a hammerhead/T is used, the top of the “T” must be 60 ft minimum length. CWUIC also prescribes locations and spacing of turnarounds/turnouts tied to driveway length and parcel zoning. § 403.3 / §§ 403.1.6 & 403.1.9
- The California Fire Code Appendix D (often applied by local jurisdictions in conjunction with CWUIC) provides additional dead‑end width/turnaround requirements by length (for example, 20 ft min width for 0–500 ft; 26 ft required for some longer dead‑ends and when hydrants are present 26 ft minimum) — use Appendix D Table D103.4 when the Fire Code is the referenced tool.
Clearances & structures
- Vertical clearance: 13 ft‑6 in unobstructed is required for driveways and generally for fire apparatus access roads (CWUIC references Vehicle Code requirements). § 403.3 / § 403.1.2
- Horizontal clearance adjacent to driveways: 14 ft unobstructed horizontal clearance is required for driveways. § 403.3 / § 403.1.2
- Surface / load: Roads must be designed/maintained to support fire apparatus of at least 75,000 lb; road and driveway structures (bridges) must support 40,000 lb or be engineered/designed and posted when different. CWUIC requires aggregate base and references AASHTO HB‑17 for bridges. § 403.3 / § 403.1.3 & § 403.1.8
Exceptions & special cases
- Local jurisdiction approval may allow:
- One‑lane bridges with adequate unobstructed visibility and turnouts at both ends (bridge design & signing required). § 403.1.8
- Grade increases above 16% up to 20% with approved mitigations. § 403.1.4
- One‑way roads in limited cases (see connection, length and turnout requirements). § 403.1.2
- Variations where the California Fire Code or local ordinance applies different or supplementary criteria (e.g., Appendix D’s dead‑end widths/turnarounds). See Appendix D Table D103.4.
- Bridges and elevated surfaces are handled specially: engineering per AASHTO HB‑17, posting of load limits where required, and vehicle‑load signage. § 403.1.8
- When a fire hydrant is located on the access road, the Fire Code Appendix D sets a 26‑ft minimum road width (exclusive of shoulders). Use that requirement where the Fire Code is adopted/enforced locally.
If any specific CWUIC subsections such as § 403.3 or § 403.7 are needed verbatim, the file excerpts in the supplied documents reproduce the Title 14 CCR (1273.xx) provisions that the CWUIC uses; the detailed dimensional requirements appear in those reproduced Title 14 sections (e.g., 1273.01–1273.08) as shown above. The CWUIC index ties § 403.3 to “Fire apparatus access roads” and § 403.7 to grade; the concrete numbers are provided in the Title 14 text reproduced in the CWUIC excerpts.
Common mistakes
- Assuming 20 ft includes shoulders or curb and gutter — CWUIC dimensions are exclusive of shoulders and striping; the required two 10‑ft lanes is the clear traffic lane width. § 403.1.2
- Forgetting the added surface width on curves: small inside radii (50–100 ft) require +4 ft, and 100–200 ft require +2 ft — this is not optional. § 403.1.5
- Confusing driveway requirements with road requirements — driveways have their own clearance widths (e.g., 14 ft horizontal clearance, 13 ft‑6 in vertical clearance) even when a driveway lane is only 10 ft wide. § 403.1.2
- Applying Fire Code Appendix D numbers without checking local adoption — many jurisdictions use both CWUIC and the California Fire Code; Appendix D gives helpful supplemental tables (e.g., D103.4), but local adoption or ordinance may control. Appendix D / D103.4
- Not posting weight/vertical clearances or bridge limits — CWUIC requires signing when bridges or elevated surfaces differ in capacity. § 403.1.8
Worked example — concrete scenario
Scenario: A new subdivision parcel layout includes a dead‑end two‑lane road that will terminate at a cul‑de‑sac. The dead‑end road length from the intersection to the terminus is 600 ft. The parcels served are each less than 1 acre.
Step‑by‑step application of the CWUIC and supplemental Fire Code:
- Access requirement: Because this is a new subdivision, provide fire apparatus access roads per § 402.1.1 (CWUIC — follow the Fire Code and CWUIC Section 403).
- Road width: For a two‑way road, provide two 10‑ft traffic lanes = 20 ft minimum clear width (exclusive of shoulders/striping). § 403.1.2
- Dead‑end length & turnaround: The dead‑end is 600 ft. Use CWUIC turnaround rules (turnarounds are required on dead‑end roads) and consult the Fire Code Appendix D Table D103.4 for recommended width/turnaround: Appendix D indicates that for dead‑end lengths 501–750 ft the road width should be 26 ft and an approved turnaround (e.g., 120‑ft hammerhead, 60‑ft “Y”, or 96‑ft diameter cul‑de‑sac) is required. Therefore, to satisfy both CWUIC turnabout requirements and Appendix D guidance, plan for a 26‑ft width at the dead‑end approach/turnaround and provide one of the accepted turnaround configurations.
- Grade check: Ensure no part of the approach or turnaround exceeds 16% grade unless the local jurisdiction approves higher grade with mitigation (up to 20%). § 403.1.4 / § 403.7
- Clearances & structure: Confirm 13 ft‑6 in vertical clearance along the route, and that the road surface supports 75,000 lb apparatus; if any bridge is used, ensure AASHTO design and posted limits. § 403.1.2, § 403.1.3, § 403.1.8
Result: Provide 20 ft minimum lane width along most of the two‑lane route, expand to 26 ft and a 96‑ft radius cul‑de‑sac (or other accepted turnaround) at the terminus, keep grades ≤16% or obtain approval for steeper, and maintain the required vertical and horizontal clearances. Use posted signage and engineering documentation for bridges/structures as required.
Related provisions (CWUIC sections)
- § 402.1.1 — Subdivision access requirement: new subdivisions shall be provided with fire apparatus access roads in accordance with the Fire Code and Section 403.
- § 403.1.2 — Width requirements (two‑lane, one‑way, driveway lanes; vertical clearance references).
- § 403.1.3 — Road surfaces and load‑bearing requirements (75,000 lb apparatus).
- § 403.1.4 — Grades (16% limit; 20% with approval).
- § 403.1.5 — Horizontal inside radius of curvature and added surface widths on curves.
- § 403.1.6 — Turnarounds (40‑ft turning radius; hammerhead/T dimensions; proximity to buildings).
- § 403.1.7 — Turnouts (12 ft × 30 ft with 25 ft taper).
- § 403.1.8 — Road and driveway structures; bridges and posted limits; one‑lane bridges/turnouts condition.
- CWUIC references the California Fire Code Appendix D (D103.1, Table D103.4) for supplementary minimums (hydrant locations, dead‑end widths/turnarounds).
Code references
Grounded in the retrieved California Wildland-Urban Interface Code — click a citation to read the verbatim passage:
CWUIC § 1273.02 High relevance — show source text
(a) Roads shall be designed and maintained to support the imposed load of fire apparatus weighing at least 75,000 pounds and provide an aggregate base. (b) Road and driveway structures shall be designed and maintained to support at least 40,000 pounds. (c) Project proponent shall provide engineering specifications to support design, if requested by the local jurisdiction.
[CCR, Title 14 §1273.02]
403.1.4 Grades.
(a) At no point shall the grade for all roads and driveways exceed 16 percent. (b) The grade may exceed 16 percent, not to exceed 20 percent, with approval from the local jurisdiction and with mitigations to provide for same practical effect.
[CCR, Title 14 §1273.03]
403.1.5 Radius.
(a) No road or road structure shall have a minimum horizontal inside radius of curvature of fifty (50) feet. An additional surface width of four (4) feet shall be added to curves of 50–100 feet radius; two (2) feet to those from 100–200 feet. (b) The length of vertical curves in roadways, exclusive of gutters, ditches and drainage structures designed to hold or divert water, shall be not less than one hundred (100) feet.
[CCR, Title 14 §1273.04]
403.1.6 Turnarounds.
(a) Turnarounds are required on driveways and dead-end roads. (b) The minimum turning radius for a turnaround shall be forty (40) feet, not including parking, in accordance with the figures in 14 CCR §§ 1273.05(e) and 1273.05(f). If a hammerhead/T is used instead, the top of the “T” shall be a minimum of sixty (60) feet in length. (c) Driveways exceeding 150 feet in length, but less than 800 feet in length, shall provide a turnout near the midpoint of the drive- way. Where the driveway exceeds 800 feet, turnouts shall be provided not more than 400 feet apart. (d) A turnaround shall be provided on driveways over 300 feet in length and shall be within fifty (50) feet of the building. (e) Each dead-end road shall have a turnaround constructed at its terminus. Where parcels are zoned five (5) acres or larger, turn- arounds shall be provided at a maximum of 1,320-foot intervals. (f) Figure A. Turnarounds on roads with two ten-foot traffic lanes. (g) Figure B. Turnarounds on driveways with one ten-foot traffic lane.
[CCR, Title 14 §1273.05]
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WILDLAND-URBAN INTERFACE AREA REQUIREMENTS
FIGURE A—TURNAROUND WITH TWO 10-FOOT TRAFFIC LANES
FIGURE B—TURNAROUND WITH ONE 10-FOOT TRAFFIC LANE
403.1.7 Turnouts. Turnouts shall be a minimum of twelve (12) feet wide and thirty (30) feet long with a minimum twenty-five-foot taper on each end. [CCR, Title 14 §1273.06]
CWUIC § 4-3 High relevance — show source text
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WILDLAND-URBAN INTERFACE AREA REQUIREMENTS
403.1.2 Width.
(a) All Roads shall be constructed to provide a minimum of two ten-foot traffic lanes, not including shoulder and striping. These traffic lanes shall provide for two-way traffic flow to support emergency vehicle and civilian egress, unless other standards are provided in this article or additional requirements are mandated by local jurisdictions or local subdivision requirements. Verti- cal clearances shall conform to the requirements in California Vehicle Code Section 35250. (b) All one-way roads shall be constructed to provide a minimum of one twelve-foot traffic lane, not including Shoulders. The Local Jurisdiction may approve One-way Roads. (1) All one-way roads shall, at both ends, connect to a road with two traffic lanes providing for travel in different directions, and shall provide access to an area currently zoned for not more than ten (10) Residential Units. (2) In no case shall a One-way Road exceed 2,640 feet in length. A turnout shall be placed and constructed at approximately the midpoint of each One-way Road. (c) All Driveways shall be constructed to provide a minimum of one (1) ten-foot traffic lane, fourteen (14) feet unobstructed hori- zontal clearance, and unobstructed vertical clearance of thirteen feet, six inches (13' 6”).
[CCR, Title 14 §1273.01]
403.1.3 Road surfaces.
(a) Roads shall be designed and maintained to support the imposed load of fire apparatus weighing at least 75,000 pounds and provide an aggregate base. (b) Road and driveway structures shall be designed and maintained to support at least 40,000 pounds. (c) Project proponent shall provide engineering specifications to support design, if requested by the local jurisdiction.
[CCR, Title 14 §1273.02]
403.1.4 Grades.
(a) At no point shall the grade for all roads and driveways exceed 16 percent. (b) The grade may exceed 16 percent, not to exceed 20 percent, with approval from the local jurisdiction and with mitigations to provide for same practical effect.
[CCR, Title 14 §1273.03]
403.1.5 Radius.
(a) No road or road structure shall have a minimum horizontal inside radius of curvature of fifty (50) feet. An additional surface width of four (4) feet shall be added to curves of 50–100 feet radius; two (2) feet to those from 100–200 feet. (b) The length of vertical curves in roadways, exclusive of gutters, ditches and drainage structures designed to hold or divert water, shall be not less than one hundred (100) feet.
[CCR, Title 14 §1273.04]
403.1.6 Turnarounds.
(a) Turnarounds are required on driveways and dead-end roads. (b) The minimum turning radius for a turnaround shall be forty (40) feet, not including parking, in accordance with the figures in 14 _CCR §§ 1273.05(e) and 1273.05(f).
CWUIC § 1273.02 High relevance — show source text
Vertical clearances shall conform to the requirements in California Vehicle Code section 35250._ (b) All One-way Roads shall be constructed to provide a minimum of one twelve (12) foot traffic lane, not including Shoulders. The Local Jurisdiction may approve One-way Roads. (1) All one-way roads shall, at both ends, connect to a road with two traffic lanes providing for travel in different directions, and shall provide access to an area currently zoned for no more than ten (10) Residential Units. (2) In no case shall a One-way Road exceed 2,640 feet in length. A turnout shall be placed and constructed at approximately the midpoint of each One-way Road. (c) All driveways shall be constructed to provide a minimum of one (1) ten (10) foot traffic lane, fourteen (14) feet unobstructed horizontal clearance, and unobstructed vertical clearance of thirteen feet, six inches (13′ 6″).
Note: Authority cited: Section 4290, Public Resources Code. Reference: Sections 4290 and 4291, Public Resources Code.
1273.02 Road surfaces.
(a) Roads shall be designed and maintained to support the imposed load of fire apparatus weighing at least 75,000 pounds and provide an aggregate base. (b) Road and driveway structures shall be designed and maintained to support at least 40,000 pounds. (c) Project proponent shall provide engineering specifications to support design, if requested by the local jurisdiction.
Note: Authority cited: Section 4290, Public Resources Code. Reference: Sections 4290 and 4291, Public Resources Code.
1273.03 Grades.
(a) At no point shall the grade for all roads and driveways exceed 16 percent. (b) The grade may exceed 16%, not to exceed 20%, with approval from the local jurisdiction and with mitigations to provide for same practical effect.
Note: Authority cited: Section 4290, Public Resources Code. Reference: Sections 4290 and 4291, Public Resources Code.
1273.04 Radius.
(a) No road or road structure shall have a horizontal inside radius of curvature of less than fifty (50) feet. An additional surface width of four (4) feet shall be added to curves of 50-100 feet radius; two (2) feet to those from 100-200 feet. (b) The length of vertical curves in roadways, exclusive of gutters, ditches, and drainage structures designed to hold or divert water, shall be not less than one hundred (100) feet.
Note: Authority cited: Section 4290, Public Resources Code. Reference: Sections 4290 and 4291, Public Resources Code.
1273.05 Turnarounds.
(a) Turnarounds are required on driveways and dead-end roads. (b) The minimum turning radius for a turnaround shall be forty (40) feet, not including parking, in accordance with the figures in 14 CCR §§ 1273.05(e) and 1273.05(f). If a hammerhead/T is used instead, the top of the “T” shall be a minimum of sixty (60) feet in length. (c) Driveways exceeding 150 feet in length, but less than 800 feet in length, shall provide a turnout near the midpoint of the drive- way. Where the driveway exceeds 800 feet, turnouts shall be provided no more than 400 feet apart.
CWUIC § 304.8 High relevance — show source text
SECTION D102—REQUIRED ACCESS
D102.1 Access and loading. Facilities, buildings or portions of buildings hereafter constructed shall be accessible to fire department apparatus by way of an approved fire apparatus access road with an asphalt, concrete or other approved driving surface capable of supporting the imposed load of fire apparatus weighing up to 75,000 pounds (34 050 kg).
SECTION D103—MINIMUM SPECIFICATIONS
D103.1 Access road width with a hydrant. Where a fire hydrant is located on a fire apparatus access road, the minimum road width shall be 26 feet (7925 mm), exclusive of shoulders (see Figure D103.1).
FIGURE D103.1—DEAD-END FIRE APPARATUS ACCESS ROAD TURNAROUND
60-FOOT “Y”
MINIMUM CLEARANCE AROUND A FIRE HYDRANT
For SI: 1 foot = 304.8 mm.
D103.2 Grade. Fire apparatus access roads shall not exceed 10 percent in grade.
Exception: Grades steeper than 10 percent as approved by the fire code official.
D103.3 Turning radius. The minimum turning radius shall be determined by the fire code official.
D103.4 Dead ends. Dead-end fire apparatus access roads in excess of 150 feet (45 720 mm) shall be provided with width and turnaround provisions in accordance with Table D103.4.
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APPENDIX D—FIRE APPARATUS ACCESS ROADS
TABLE D103.4—REQUIREMENTS FOR DEAD-END FIRE APPARATUS ACCESS ROADS Col2 Col3 LENGTH
(feet)WIDTH
(feet)TURNAROUNDS REQUIRED 0–150 20 None required 151–500 20 120-foot Hammerhead, 60-foot “Y” or 96-foot diameter cul-de-sac in accordance with Figure D103.1 501–750 26 120-foot Hammerhead, 60-foot “Y” or 96-foot diameter cul-de-sac in accordance with Figure D103.1 Over 750 Special approval required Special approval required For SI: 1 foot = 304.8 mm. For SI: 1 foot = 304.8 mm. For SI: 1 foot = 304.8 mm. D103.5 Fire apparatus access road gates. Gates securing the fire apparatus access roads shall comply with all of the following criteria:
- Where a single gate is provided, the gate width shall be not less than 20 feet (6096 mm). Where a fire apparatus road consists of a divided roadway, the gate width shall be not less than 12 feet (3658 mm).
- Gates shall be of the horizontal swing, horizontal slide, vertical lift or vertical pivot type.
- Construction of gates shall be of materials that allow manual operation by one person.
- Gate components shall be maintained in an operative condition at all times and replaced or repaired when defective.
- Electric gates shall be equipped with a means of opening the gate by fire department personnel for emergency access. Emergency opening devices shall be approved by the fire code official.
- Methods of locking shall be submitted for approval by the fire code official.
- Electric gate operators, where provided, shall be listed in accordance with UL 325.
CWUIC § 304.8 High relevance — show source text
- The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same.
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APPENDIX D-2 2025 CALIFORNIA FIRE CODE
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D FIRE APPARATUS ACCESS ROADS
The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance or legislation of the jurisdiction.
User notes:
About this appendix: Appendix D contains more detailed elements for use with the basic access requirements found in Section 503, which gives some minimum criteria, such as a maximum length of 150 feet and a minimum width of 20 feet, but in many cases does not state specific criteria. This appendix, like Appendices B and C, is a tool for jurisdictions looking for guidance in establishing access requirements and includes criteria for multiple-family residential developments, large one- and two-family subdivisions, specific examples for various types of turnarounds for fire department apparatus and parking regulatory signage.
ICC code development note: Code change proposals to this appendix will be considered by the IFC Code Development Committee during the 2024 (Group A) Code Development Cycle.
SECTION D101—GENERAL
D101.1 Scope. Fire apparatus access roads shall be in accordance with this appendix and all other applicable requirements of the California Fire Code .
SECTION D102—REQUIRED ACCESS
D102.1 Access and loading. Facilities, buildings or portions of buildings hereafter constructed shall be accessible to fire department apparatus by way of an approved fire apparatus access road with an asphalt, concrete or other approved driving surface capable of supporting the imposed load of fire apparatus weighing up to 75,000 pounds (34 050 kg).
SECTION D103—MINIMUM SPECIFICATIONS
D103.1 Access road width with a hydrant. Where a fire hydrant is located on a fire apparatus access road, the minimum road width shall be 26 feet (7925 mm), exclusive of shoulders (see Figure D103.1).
FIGURE D103.1—DEAD-END FIRE APPARATUS ACCESS ROAD TURNAROUND
60-FOOT “Y”
MINIMUM CLEARANCE AROUND A FIRE HYDRANT
For SI: 1 foot = 304.8 mm.
D103.2 Grade. Fire apparatus access roads shall not exceed 10 percent in grade.
Exception: Grades steeper than 10 percent as approved by the fire code official.
D103.3 Turning radius. The minimum turning radius shall be determined by the fire code official.
D103.4 Dead ends. Dead-end fire apparatus access roads in excess of 150 feet (45 720 mm) shall be provided with width and turnaround provisions in accordance with Table D103.4.
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APPENDIX D—FIRE APPARATUS ACCESS ROADS
CWUIC § 1273.05 High relevance — show source text
If a hammerhead/T is used instead, the top of the “T” shall be a minimum of sixty (60) feet in_ length. (c) Driveways exceeding 150 feet in length, but less than 800 feet in length, shall provide a turnout near the midpoint of the drive- way. Where the driveway exceeds 800 feet, turnouts shall be provided not more than 400 feet apart. (d) A turnaround shall be provided on driveways over 300 feet in length and shall be within fifty (50) feet of the building. (e) Each dead-end road shall have a turnaround constructed at its terminus. Where parcels are zoned five (5) acres or larger, turn- arounds shall be provided at a maximum of 1,320-foot intervals. (f) Figure A. Turnarounds on roads with two ten-foot traffic lanes. (g) Figure B. Turnarounds on driveways with one ten-foot traffic lane.
[CCR, Title 14 §1273.05]
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FIGURE A—TURNAROUND WITH TWO 10-FOOT TRAFFIC LANES
FIGURE B—TURNAROUND WITH ONE 10-FOOT TRAFFIC LANE
403.1.7 Turnouts. Turnouts shall be a minimum of twelve (12) feet wide and thirty (30) feet long with a minimum twenty-five-foot taper on each end. [CCR, Title 14 §1273.06]
403.1.8 Road and Driveway Structures. (a) Appropriate signing, including but not limited to weight or vertical clearance limitations, one-way road or single traffic lane conditions, shall reflect the capability of each bridge. (b) Where a bridge or an elevated surface is part of a Fire Apparatus access road, the bridge shall be constructed and maintained in accordance with the American Association of State and Highway Transportation Officials Standard Specifications for High- way Bridges, 17 [th] Edition, published 2002 (known as AASHTO HB-17), hereby incorporated by reference. Bridges and elevated surfaces shall be designed for a live load sufficient to carry the imposed loads of fire apparatus. Vehicle load limits shall be posted at both entrances to bridges when required by the local authority having jurisdiction. (c) Where elevated surfaces designed for emergency vehicle use are adjacent to surfaces which are not designed for such use, barriers or signs, or both, as approved by the local authority having jurisdiction, shall be installed and maintained.
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(d) A bridge with only one traffic lane may be authorized by the Local Jurisdiction; however, it shall provide for unobstructed visi- bility from one end to the other and turnouts at both ends.
[CCR, Title 14 §1273.07]
403.1.9 Dead-end Roads.
CWUIC § 3.05 High relevance — show source text
[California Code of Regulations, Title 19, Division 1, §3.05(a)] Fire Department Access and Egress. (Roads)
(a) Roads. Required access roads from every building to a public street shall be all-weather hard-surfaced (suitable for use by fire apparatus) right-of-way not less than 20 feet in width. Such right-of-way shall be unobstructed and maintained only as access to the public street.
Exception: The enforcing agency may waive or modify this requirement if in his opinion such all-weather hard-surfaced condition is not necessary in the interest of public safety and welfare.
503.2.1 Dimensions. Fire apparatus access roads shall have an unobstructed width of not less than 20 feet (6096 mm), exclusive of shoulders, except for approved security gates in accordance with Section 503.6, and an unobstructed vertical clearance of not less than 13 feet 6 inches (4115 mm).
503.2.2 Authority. The fire code official shall have the authority to require or permit modifications to the required access widths where they are inadequate for fire or rescue operations or where necessary to meet the public safety objectives of the jurisdiction.
503.2.3 Surface. Fire apparatus access roads shall be designed and maintained to support the imposed loads of fire apparatus and shall be surfaced so as to provide all-weather driving capabilities.
503.2.4 Turning radius. The required turning radius of a fire apparatus access road shall be determined by the fire code official.
503.2.5 Dead ends. Dead-end fire apparatus access roads in excess of 150 feet (45 720 mm) in length shall be provided with an approved area for turning around fire apparatus.
503.2.6 Bridges and elevated surfaces. Where a bridge or an elevated surface is part of a fire apparatus access road, the bridge shall be constructed and maintained in accordance with AASHTO HB-17. Bridges and elevated surfaces shall be designed for a live load sufficient to carry the imposed loads of fire apparatus. Vehicle load limits shall be posted at both entrances to bridges where required by the fire code official. Where elevated surfaces designed for emergency vehicle use are adjacent to surfaces that are not designed for such use, approved barriers, approved signs or both shall be installed and maintained where required by the fire code official.
503.2.7 Grade. The grade of the fire apparatus access road shall be within the limits established by the fire code official based on the fire department’s apparatus.
503.2.8 Angles of approach and departure. The angles of approach and departure for fire apparatus access roads shall be within the limits established by the fire code official based on the fire department’s apparatus.
503.3 Marking. Where required by the fire code official, approved signs or other approved notices or markings that include the words “NO PARKING—FIRE LANE” shall be provided for fire apparatus access roads to identify such roads or prohibit the obstruction thereof. The means by which fire lanes are designated shall be maintained in a clean and legible condition at all times and be replaced or repaired when necessary to provide adequate visibility.
503.4 Obstruction of fire apparatus access roads. Fire apparatus access roads shall not be obstructed in any manner, including the parking of vehicles. The minimum widths and clearances established in Sections 503.2.1 and 503.2.2 shall be maintained at all times.
503.4.1 Traffic calming devices. Traffic calming devices shall be prohibited unless approved by the fire code official.
CWUIC § 403.1.8 High relevance — show source text
403.1.8 Road and Driveway Structures. (a) Appropriate signing, including but not limited to weight or vertical clearance limitations, one-way road or single traffic lane conditions, shall reflect the capability of each bridge. (b) Where a bridge or an elevated surface is part of a Fire Apparatus access road, the bridge shall be constructed and maintained in accordance with the American Association of State and Highway Transportation Officials Standard Specifications for High- way Bridges, 17 [th] Edition, published 2002 (known as AASHTO HB-17), hereby incorporated by reference. Bridges and elevated surfaces shall be designed for a live load sufficient to carry the imposed loads of fire apparatus. Vehicle load limits shall be posted at both entrances to bridges when required by the local authority having jurisdiction. (c) Where elevated surfaces designed for emergency vehicle use are adjacent to surfaces which are not designed for such use, barriers or signs, or both, as approved by the local authority having jurisdiction, shall be installed and maintained.
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WILDLAND-URBAN INTERFACE AREA REQUIREMENTS
(d) A bridge with only one traffic lane may be authorized by the Local Jurisdiction; however, it shall provide for unobstructed visi- bility from one end to the other and turnouts at both ends.
[CCR, Title 14 §1273.07]
403.1.9 Dead-end Roads.
(a) The maximum length of a Dead-end Road, including all Dead-end Roads accessed from that Dead-end Road, shall not exceed the following cumulative lengths, regardless of the number of parcels served:
Parcels zoned for less than one acre – 800 feet (262 m)
Parcels zoned for 1 acre to 4.99 acres – 1,320 feet (433 m)
Parcels zoned for 5 acres to 19.99 acres – 2,640 feet (866 m)
Parcels zoned for 20 acres or larger – 5,280 feet (1732 m) All lengths shall be measured from the edge of the road surface at the intersection that begins the road to the end of the road surface at its farthest point. Where a Dead-end Road crosses areas of differing zoned parcel sizes requiring different length limits, the shortest allowable length shall apply. (b) See Section 403.1.5 for Dead-end Road turnaround requirements.
[CCR, Title 14 §1273.08]
403.1.10 Gate entrances.
(a) Gate entrances shall be at least two (2) feet wider than the width of the traffic lane(s) serving that gate and a minimum width of fourteen (14) feet unobstructed horizontal clearance and unobstructed vertical clearance of thirteen feet, six inches (13' 6”). (b) All gates providing access from a road to a driveway shall be located at least thirty (30) feet from the roadway and shall open to allow a vehicle to stop without obstructing traffic on that Road. (c) Where a one-way road with a single traffic lane provides access to a gated entrance, a forty-foot turning radius shall be used. (d) Security gates shall not be installed without approval. Where security gates are installed, they shall have an approved means _of emergency operation. Approval shall be by the local authority having jurisdiction.
CWUIC § 403.2 High relevance — show source text
APPENDIX I-4 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE
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Access Applicability 402 Driveways 403.2 Fire apparatus access roads 403.3 Grade 403.7
Individual structures 402.2 Marking of roads 402.3, 403.4 Restricted 403.1
Subdivisions 402.1 Accessory Buildings and Miscellaneous Structures
Defined 202
Detached 504.11 Exempt from permit 105.3 Additions or Alterations 101.5
Address Markers 402.3 Agriculture 202 Alternative Materials or Methods 104.2.2
Appeals 112 Appendices 101.2.1 Applicable Building 202 Applicability 102 Approved 202 Approved Agency 104.2.2.6.1, 202 Authority of Code Official 104
Building 202 Building Official 202
Certificate of Completion 111 Certificate of occupancy 111.2 Revocation 111.4
Temporary occupancy 111.3
Code Official 202 Code Official, Authority 104 Community Wildland-Urban Interface (WUI) Fire Hazard Evaluation Framework Appendix C Compliance Alternatives 105 Construction Documents 106
Amended 106.10
Examination of 106.9 Information on plans and specifications 106.2 Phased 106.12
Previous approval 106.11 Retention of 106.8 Site plan 106.3 Vegetation management plans 106.4 Control of Storage Appendix A, A105 Critical Fire Weather 202
Dead-end Road 202 Defensible Space 403, 601.3 Vegetation Plan 603 Definitions 202 Designation of Wildland-Urban Interface Area 302.1
Director 202 Driveway 202 Dumping Appendix A, A106 Dwelling 202
Exterior Covering 202
INDEX
Fees 109 Findings of Fact Appendix E Fire Chief 202 Fire Danger Rating System Appendix D Fire Flow Calculation Area Application 404.5 Defined 202 Fire Hazard Severity Zones 1.1.2, 202, 302.1, 302.2, Appendix D, Appendix H Fire Protection Plans 602
Fire Weather 202
Fire-Resistance-Rated Construction 501.3 Fire-Resistive Vegetation Appendix F Fire-Retardant-Treated Lumber or
Wood 503.2, 504.5, 504.7, 504.11 Flame Spread Index 202 Flashing 504.2.1, 504.5.1 Fuel Break 202, 609 Fuel Models Appendix D Fuel Modification 202
Fuel Modification Distance 603.2
Fuel Mosaic 202 Fuel-Loading 202
General Requirements Appendix A Green Belt 202
Greenways 202
CWUIC § 1273.09 Medium relevance — show source text
Note: Authority cited: Section 4290, Public Resources Code. Reference: Sections 4290 and 4291, Public Resources Code.
1273.09 Gate Entrances.
(a) Gate entrances shall be at least two (2) feet wider than the width of the traffic lane(s) serving that gate and a minimum width of fourteen (14) feet unobstructed horizontal clearance and unobstructed vertical clearance of thirteen feet, six inches (13' 6”). (b) All gates providing access from a road to a driveway shall be located at least thirty (30) feet from the roadway and shall open to allow a vehicle to stop without obstructing traffic on that Road. (c) Where a one-way road with a single traffic lane provides access to a gated entrance, a forty (40) foot turning radius shall be used.
(d) Security gates shall not be installed without approval. Where security gates are installed, they shall have an approved means of emergency operation. Approval shall be by the local authority having jurisdiction. The security gates and the emergency operation shall be maintained operational at all times.
Note: Authority cited: Section 4290, Public Resources Code. Reference: Sections 4290 and 4291, Public Resources Code.
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APPENDIX H—REFERENCED CALIFORNIA DOCUMENTS
1273.10 Road and driveway structures. (a) Appropriate signing, including but not limited to weight or vertical clearance limitations, one-way road or single traffic lane conditions, shall reflect the capability of each bridge. (b) Where a bridge or an elevated surface is part of a fire apparatus access road, the bridge shall be constructed and maintained in accordance with the American Association of State and Highway Transportation Officials Standard Specifications for Highway Bridges, 17th Edition, published 2002 (known as AASHTO HB-17), hereby incorporated by reference. Bridges and elevated surfaces shall be designed for a live load sufficient to carry the imposed loads of fire apparatus. Vehicle load limits shall be posted at both entrances to bridges when required by the local authority having jurisdiction. (c) Where elevated surfaces designed for emergency vehicle use are adjacent to surfaces which are not designed for such use, barriers, or signs, or both, as approved by the local authority having jurisdiction, shall be installed, and maintained. (d) A bridge with only one traffic lane may be authorized by the local jurisdiction; however, it shall provide for unobstructed visibil- ity from one end to the other and turnouts at both ends.
Note: Authority cited: Section 4290, Public Resources Code. Reference: Sections 4290 and 4291, Public Resources Code.
Article 3 Signing and Building Numbering
1274.00. Intent. To facilitate locating a fire and to avoid delays in response, all newly constructed or approved Roads and Buildings shall be designated by names or numbers posted on signs clearly visible and legible from the Road. This section shall not restrict the size of letters or numbers appearing on road signs for other purposes.
CWUIC § 3.1 Medium relevance — show source text
Its purpose is to provide fire protection measures supplemental to those found in Chapter 6 to reduce the threat of wildfire in a wildland-urban interface area and improve the capability for controlling such fires. This appendix includes detailed requirements for vegetation control; the code official’s authority to close wildland-interface areas in times of high fire danger; control of fires, fireworks usage and other sources of ignition; storage of hazardous materials and combustibles; bans on the dumping of waste materials and ashes and coals in wildland-urban interface areas; protection of pumps and water supplies; and limits on temporary uses within the wildland-urban interface area.
SECTION A101—GENERAL
A101.1 Scope. The provisions of this appendix establish general requirements applicable to new and existing properties located within wildland-urban interface areas .
A101.2 Objective. The objective of this appendix is to provide necessary fire protection measures to reduce the threat of wildfire in a wildland-urban interface area and improve the capability of controlling such fires.
SECTION A102—VEGETATION CONTROL
A102.1 General. Vegetation control shall comply with Sections A102.2 through A102.4.
A102.2 Clearance of brush or vegetative growth from roadways. The code official is authorized to require areas within 10 feet (3048 mm) on each side of portions of fire apparatus access roads and driveways to be cleared of nonfire-smart vegetation growth.
Exception: Single specimens of trees, ornamental vegetative fuels or cultivated ground cover, such as green grass, ivy, succulents or similar plants used as ground cover, provided they do not form a means of readily transmitting fire.
A102.3 Clearance of brush and vegetative growth from electrical transmission and distribution lines. Clearance of brush and vegetative growth from electrical transmission and distribution lines shall be in accordance with Sections A102.3.1 through A102.3.2.3.
Exception: Sections A102.3.1 through A102.3.2.3 do not authorize persons not having legal right of entry to enter on or damage the property of others without consent of the owner.
A102.3.1 Support clearance. Persons owning, controlling, operating or maintaining electrical transmission or distribution lines shall have an approved program in place that identifies poles or towers with equipment and hardware types that have a history of becoming an ignition source, and provides a combustible free space consisting of a clearing of not less than 10 feet (3048 mm) in each direction from the outer circumference of such pole or tower during such periods of time as designated by the code official.
Exception: Lines used exclusively as telephone, telegraph, messenger call, alarm transmission or other lines classed as communication circuits by a public utility.
A102.3.2 Electrical distribution and transmission line clearances. Clearances between vegetation and electrical lines shall be in accordance with Sections A102.3.2.1 through A102.3.2.3.
A102.3.2.1 Trimming clearance. At the time of trimming, clearances not less than those established by Table A102.3.2.1 shall be provided. The radial clearances shown are minimum clearances that shall be established, at time of trimming, between the vegetation and the energized conductors and associated live parts.
Exception: The code official is authorized to establish minimum clearances different than those specified by Table A102.3.2.1 when evidence substantiating such other clearances is submitted to and approved by the code official.
CWUIC § 301.1 Medium relevance — show source text
Adopting Agency BSC BSC-
CGSFM Col5 HCD Col7 Col8 DSA Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC Adopting Agency BSC BSC-
CGT-24 T-19* 1 2 1/AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5 Adopt Entire Chapter Adopt Entire Chapter as
amended (amended sections
listed below)X Adopt only those sections that
are listed below[California Code of Regulations,
Title 19, Division 1]Chapter / Section 301.1 X 301.2 X 302.1 X 302.2 X - The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Wildland-Urban Interface Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
The California Code of Regulations (CCR), Title 14, Division 1.5 provisions that are found in the California Wildland-Urban Interface Code are not listed in the Matrix Adoption Tables as they are not within the State Fire Marshal’s authority to adopt. These provisions are a reprint from the current CCR, Title 14, Division 1.5 text for the code user’s convenience only and are identified in the body of the code by square brackets containing references to applicable Title 14 sections.
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3 WILDLAND-URBAN INTERFACE AREAS
User notes:
About this chapter: Chapter 3 provides for the fundamental aspect of applying the code—the legal declaration and establishment of wildlandurban interface areas within the adopting jurisdiction, mapping of the area, periodic review and updates.
SECTION 301—GENERAL
CWUIC § 1.1. High relevance — show source text
Exceptions:
- The fire code official is authorized to increase the dimension of 150 feet (45 720 mm) where any of the following conditions occur:
1.1. The building is equipped throughout with an approved automatic sprinkler system installed in accordance with Section 903.3.1.1, 903.3.1.2 or 903.3.1.3. 1.2. Fire apparatus access roads cannot be installed because of location on property, topography, waterways, nonnegotiable grades or other similar conditions, and an approved alternative means of fire protection is provided. 1.3. There are not more than two Group R-3 or Group U occupancies. 2. Where approved by the fire code official, fire apparatus access roads shall be permitted to be exempted or modified for solar photovoltaic power generation facilities.
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FIRE SERVICE FEATURES
503.1.2 Additional access. The fire code official is authorized to require more than one fire apparatus access road based on the potential for impairment of a single road by vehicle congestion, condition of terrain, climatic conditions or other factors that could limit access.
503.1.3 High-piled storage. Fire department vehicle access to buildings used for high-piled combustible storage shall comply with the applicable provisions of Chapter 32.
503.2 Specifications. Fire apparatus access roads shall be installed and arranged in accordance with Sections 503.2.1 through 503.2.8.
[California Code of Regulations, Title 19, Division 1, §3.05(a)] Fire Department Access and Egress. (Roads)
(a) Roads. Required access roads from every building to a public street shall be all-weather hard-surfaced (suitable for use by fire apparatus) right-of-way not less than 20 feet in width. Such right-of-way shall be unobstructed and maintained only as access to the public street.
Exception: The enforcing agency may waive or modify this requirement if in his opinion such all-weather hard-surfaced condition is not necessary in the interest of public safety and welfare.
503.2.1 Dimensions. Fire apparatus access roads shall have an unobstructed width of not less than 20 feet (6096 mm), exclusive of shoulders, except for approved security gates in accordance with Section 503.6, and an unobstructed vertical clearance of not less than 13 feet 6 inches (4115 mm).
503.2.2 Authority. The fire code official shall have the authority to require or permit modifications to the required access widths where they are inadequate for fire or rescue operations or where necessary to meet the public safety objectives of the jurisdiction.
503.2.3 Surface. Fire apparatus access roads shall be designed and maintained to support the imposed loads of fire apparatus and shall be surfaced so as to provide all-weather driving capabilities.
503.2.4 Turning radius. The required turning radius of a fire apparatus access road shall be determined by the fire code official.
503.2.5 Dead ends. Dead-end fire apparatus access roads in excess of 150 feet (45 720 mm) in length shall be provided with an approved area for turning around fire apparatus.
Frequently asked questions
What is the single most important measurement to verify on a proposed access road?
Confirm an approved fire apparatus access road reaches the building and provides the clear two 10‑ft traffic lanes (20 ft clear width) or the alternative required width for the specific situation, as required by the CWUIC and local authorities.
Can grades exceed 16%?
Only with local‑jurisdiction approval and mitigating measures to provide the same practical effect; the CWUIC’s baseline is 16% (up to 20% with approval). § 403.7 / § 403.1.4
Are shoulders included in the required width?
No. CWUIC lane widths are stated exclusive of shoulders and striping — the required two 10‑ft lanes is the clear travel width.
Do I need to design the road to a specific vehicle weight?
Yes — roads must be designed and maintained to support fire apparatus weighing 75,000 lb and road/driveway structures per CWUIC text (bridges/elevated surfaces have separate engineering requirements).
When should I consult the Fire Code Appendix D?
Use Appendix D when your jurisdiction adopts and enforces it as a supplement; Appendix D gives specific dead‑end width/turnaround tables (e.g., 26 ft width where hydrants are present or for longer dead‑ends).
If my driveway is longer than 300 ft, what must I provide?
A turnaround must be provided on driveways over 300 ft in length and it must be within 50 ft of the building per CWUIC turnabout provisions.
More in California Wildland-Urban Interface Code
- Administration and Definitions
- Board of Appeals, Administration & Enforcement (permits, code official duties, appeals process)
- Wildland‑Urban Interface Area Designation & Mapping
- Fire Service Access & Water Supply (fire apparatus roads, driveways, hydrants, draft sites, standby power)
- Wildland‑Urban Interface Area Requirements (access, water, premises identification, key boxes)
- Referenced Standards & Test Methods
- Special Building Construction Regulations (ignition‑resistant construction, roof/vent/assembly requirements)
- Appendices and Model Ordinances (vegetation plans, severity‑zone adoption, home‑hardening guidance)
- Fire Protection Requirements (fire protection plans, systems, safety element provisions)
- Referenced California Documents & Matrix (CCR/Title 14 & 19 cross‑references, statutory references)
- Vegetation Management & Defensible Space (vegetation plans, maintenance, fire‑smart characteristics)
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