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Earlier editions: 2026-09

Title 10 — VEHICLES AND TRAFFIC

Diamond Bar Municipal Code Ch. 10.08 Traffic Signs, Signals and Devices

Diamond Bar Municipal Code · 2026-10 edition · updated 2026-10-04 · Diamond Bar

Cite as: Diamond Bar Municipal Code Chapter 10.08 · Text as of 2026-10-04

Sec. 10.08.010. - Official signs designated; determination authority.

The city council shall determine and designate the character of all official warning, regulatory and direction signs other than those signs for which specifications are established by the Vehicle Code.

(Ord. No. 14(1989), § 2(15.20.010), 6-27-89)

Exceptions & meaning →

Sec. 10.08.020. - Character of signals.

The city council shall determine the character of all official traffic control signals where the California Vehicle Code or California state law, regulations or requirements do not so provide.

(Ord. No. 14(1989), § 2(15.20.020), 6-27-89; Ord. No. 05(1999), § 2, 5-18-99)

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Sec. 10.08.030. - Locations where signals are required.

The city council shall designate at what intersections and other locations traffic shall be controlled by official traffic control signals.

(Ord. No. 14(1989), § 2(15.20.030), 6-27-89)

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Sec. 10.08.040. - Placement, maintenance and operation.

The city engineer shall place, maintain and operate or cause to be placed, maintained and operated, all official traffic control signals authorized by the city council as provided in this title.

(Ord. No. 14(1989), § 2(15.20.040), 6-27-89)

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Sec. 10.08.050. - Hours of operation.

The city engineer shall determine the hours and days during which any traffic control device shall be in operation or be in effect, except in those cases where such hours or days are specified in this title, or established by order of the city council.

(Ord. No. 14(1989), § 2(15.20.050), 6-27-89)

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Sec. 10.08.060. - Signs prerequisite to enforcement.

No provisions of this title for which signs are required may be enforced against any alleged violator thereof, if at the time and place of such alleged violation any sign required by this title is not in proper position and sufficiently legible to be seen by an ordinarily observant person.

(Ord. No. 14(1989), § 2(15.20.080), 6-27-89)

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Sec. 10.08.070. - Warning and directional signs.

The city engineer may place and maintain all official warning and directional signs necessary to the proper control of traffic. No person shall operate any vehicle in violation of any such signs.

(Ord. No. 14(1989), § 2(15.20.090), 6-27-89; Ord. No. 05(1999), § 3, 5-18-99)

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Sec. 10.08.075. - Regulatory signs.

The city engineer shall place all regulatory signs and other markings required or authorized either by this title or by finding of the city council or finding of the city engineer. No person shall operate any vehicle in violation of any such signs or other markings.

(Ord. No. 05(1999), § 4, 5-18-99)

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Sec. 10.08.080. - Parking signs.

The city engineer shall place and maintain all signs and demarcations required or authorized pursuant to chapter 10.16 of this title or the California Vehicle Code. No person shall stop, park or leave standing any vehicle whether attended or unattended in violation of any sign erected or any demarcation established in accordance with this section or any restriction stated upon any such sign or demarcation.

(Ord. No. 14(1989), § 2(15.20.100), 6-27-89; Ord. No. 05(1999), § 5, 5-18-99)

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Sec. 10.08.090. - Lane guidelines and other pavement markings.

The city engineer shall place appropriate traffic guidelines dividing highways into the number of traffic lanes that is proper and necessary and shall place such other pavement markings as are necessary to direct vehicular movements in accordance with requirements of this title and the state Vehicle Code. No person shall operate any vehicle in violation of such traffic guidelines or pavement markings.

(Ord. No. 14(1989), § 2(15.20.120), 6-27-89; Ord. No. 05(1999), § 6, 5-18-99)

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Sec. 10.08.100. - Parking space markings.

The city engineer may install and maintain parking space markings to indicate parking space adjacent to curb where authorized parking is permitted. When such parking space markings are placed in the highway, subject to other and more restrictive limitations, no vehicle shall be stopped or left standing other than within a single space unless the size or shape of such vehicle makes compliance impossible.

(Ord. No. 14(1989), § 2(15.20.130), 6-27-89)

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Sec. 10.08.110. - Safety zones.

The city engineer may install and maintain safety zones at all locations where there is particular danger to standing pedestrians and may locate and designate the same upon the surface of the roadway by appropriate devices, signs or marks.

(Ord. No. 14(1989), § 2(15.20.140), 6-27-89)

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Sec. 10.08.120. - Equestrian crossing signs.

The city engineer shall erect appropriate signs of a type approved by the director of public works indicating those intersections of bridle paths and highways which the city council, pursuant to Vehicle Code § 21805, by resolution has designated as equestrian crossings.

(Ord. No. 14(1989), § 2(15.20.150), 6-27-89)

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Sec. 10.08.130. - Temporary removal of signs during construction, repair or emergency.

Whenever because of the construction, alteration, repair or improvement of any highway, or temporary detour, or because of other emergency situation, a traffic hazard will be created by compliance with the provisions of this title and that the city engineer so finds, he shall either remove or cover up any sign or other traffic marking which requires such compliance. While such sign or other marking is removed or covered up, the effect of such provision of this title is suspended. At the end of such emergency, unless otherwise determined by the city council, the city engineer shall replace or uncover such sign or marking.

(Ord. No. 14(1989), § 2(15.20.160), 6-27-89)

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Sec. 10.08.140. - Weight limit signs; emergency procedures.

If a weight limit is suspended pursuant to this chapter and a different weight limit is necessary, the city engineer shall erect and maintain, during the emergency, appropriate signs. At the end of the emergency, the city engineer shall remove such temporary signs and uncover and restore the original signs unless the city council otherwise determines. No person shall operate any vehicle in excess of the posted weight limit upon any street or highway where such signs have been erected.

(Ord. No. 14(1989), § 2(15.20.170), 6-27-89; Ord. No. 05(1999), § 7, 5-18-99)

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Sec. 10.08.150. - Unauthorized signs, signals and lights; removal requirements.

The city engineer and the sheriff shall remove every unofficial sign, signal or device which purports to be or is an imitation of or resembles an official traffic sign or signal, or which attempts to direct the movement of traffic, or which hides from view any official traffic sign or signal, or which in any other respect violates the provisions of Vehicle Code § 21465 or 21466.

(Ord. No. 14(1989), § 2(15.20.210), 6-27-89)

Exceptions & meaning →

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