Sec. 13-33. - Road and driveway structures (bridges).

(a)

All road and driveway structures shall be designed, constructed, and maintained in accordance with applicable sections of the county building code, the standard specifications for highway bridges, and any administrative regulations adopted pursuant to Section 13-2, and shall have a minimum designed live-load capacity of HB-17. All road and driveway structures shall be constructed pursuant to a valid building permit. All road and driveway structures shall be inspected according to the administrative and inspection provisions of the county building code.

(b)

All road and driveway structures shall have appropriate signing identifying structure capability, including weight and vertical clearance limits, installation and certification date and any one-way road or single traffic lane conditions.

(c)

All road and driveway structures having only one (1) traffic lane shall be constructed to provide a minimum unobstructed width of twelve feet (12') and an unobstructed vertical clearance of fifteen feet (15') along the entire length of the structure. It shall provide for unobstructed visibility from one (1) end to the other and shall have turnouts at both ends. Any structure with a minimum unobstructed width of twelve feet (12') shall not exceed sixty-five feet (65') in length.

(d)

All structures not meeting subsection (c), shall be constructed to provide a minimum traffic lane as required in other sections of this code and an unobstructed vertical clearance of fifteen feet (15') along the entire length of the structure.

(e)

Any road or driveway structure required to have a turnaround may have either a hammerhead/T, a stub out, or terminus bulb. All turnarounds shall have a minimum turning radius of forty feet (40'), bulbs shall be forty feet (40') from the center point of the bulb, hammerhead/T and stub out shall have entry and exit curves of no

less than a forty-foot radius. If a hammerhead/T is used, the top of the "T" shall be a minimum of sixty feet (60') in length. If a stub is used, then the length of the turnaround shall be forty feet (40'), as measured from the road or driveway edge. The minimum width of either a hammerhead/T or a stub out shall be equivalent to the road or driveway entering the turnaround.

(f)

Any road or driveway structure required to have a turnout, shall have a turnout that is a minimum of twenty-two feet (22') wide, including the road and the turnout, and thirty feet (30') long with a minimum taper of twenty-five feet (25') on each end. The length of the turnout shall be measured along the road or driveway centerline.

(g)

All new bridge structures shall meet a minimum standard of HS-20 and be of non-combustible construction unless approved by the building and fire code official.

(h)

All existing private bridges and elevated surfaces that are a part of the fire department access road shall be evaluated by a California licensed civil engineer experienced in structural engineering or a California licensed structural engineer, for safety and weight rating, in accordance with American Association of State Highway and Transportation Officials (AASHTO) Manual: "The Manual for Bridge Evaluation," Second Edition, or other approved standard. Vehicle load limits shall be posted at both entrances to bridges. All bridges and elevated structures providing fire department access shall be inspected or maintained when directed by the fire code official.

(Ord. No. 6396, § II, 12-6-2022; Ord. No. 6318, § I, 8-11-2020)

State Law reference— California Code of Regulations, Title 14 Natural Resources Code, Division 1.5, Chapter 7, Subchapter 2, Article 1-5, SRA Fire Safe Regulations, 1273.07.