Earlier editions: 2026-09
Title 10 — VEHICLES AND TRAFFIC›Chapter 10.12 — OPERATION
Diamond Bar Municipal Code Div. 2 Speed
Diamond Bar Municipal Code · 2026-10 edition · updated 2026-10-04 · Diamond Bar
Cite as: Diamond Bar Municipal Code Division 2 · Text as of 2026-10-04
Sec. 10.12.310. - Prima facie speed limits on specified city streets.¶
(a) The prima facie speed which is most appropriate to facilitate the orderly movement of traffic and is a speed limit which is reasonable and safe on such portion of each such street is set forth in this subsection for each street:
| STREET | LIMITS | SPEED LIMIT |
|---|---|---|
| Avenida Rancheros | Golden Springs Dr. to Northeast City Limit | 45 |
| Brea Canyon Rd | North City Limit to Golden Springs Dr. | 40 |
| Brea Canyon Rd. | Golden Springs Dr. to Via Sorella | 45 |
| Brea Canyon Rd. | Via Sorella to Pathfinder Rd. | 45 |
| Brea Canyon Rd. | Pathfinder Rd. to Fountain Springs Rd. | 40 |
| Brea Canyon Rd. | Fountain Springs Rd. to Copper Canyon Dr. | 40 |
| Brea Canyon Rd. | Copper Canyon Dr. to South City Limit | 50 |
| Brea Canyon Cut-Off | West City Limit to SR 57 Freeway | 40 |
| Bridgegate Dr. | Copley Dr. to Valley Vista Dr. | 35 |
| Chino Ave. | Chino Hills Pkwy. to East City Limit | 50 |
| Chino Hills Pkwy. | North City Limit to South City Limit | 50 |
| Copley Dr. | Golden Springs Dr. to Bridgegate Dr. | 35 |
| Diamond Bar Blvd. | SR 57 Freeway to Mountain Laurel Way | 45 |
| Diamond Bar Blvd. | Mountain Laurel Way to Grand Ave. | 40 |
| Diamond Bar Blvd. | Grand Ave. to Goldrush Dr. | 45 |
| Diamond Bar Blvd. | Goldrush Dr. to Golden Springs Dr. | 40 |
| Diamond Bar Blvd. | Golden Springs Dr. to SR 60 Eastbound Ramps | 35 |
| Diamond Bar Blvd. | SR 60 Eastbound Ramps to Highland Valley Rd. | 40 |
| Diamond Bar Blvd. | Highland Valley Rd. to Temple Ave. | 45 |
| Gateway Center Dr. | Bridgegate Dr. to Golden Springs Dr. | 35 |
| Golden Springs Dr. | West City Limit to Lemon Ave. | 45 |
| Golden Springs Dr. | Lemon Ave. to 900′ west of Gona Ct. | 45 |
| Golden Springs Dr. | 900′ west of Gona Ct. to 1,300′ east of Adel Ave. | 40 |
| Golden Springs Dr. | 1,300′ east of Adel Ave. to Sabana Drive | 45 |
| Golden Springs Dr. | Sabana Drive to Platina Dr. | 40 |
| Golden Springs Dr. | Platina Dr. to Avenida Rancheros/ |
45 |
| Grand Ave. | North City Limit to East City Limit | 45 |
| Lemon Ave. | North City Limit to Golden Springs Dr. | 40 |
| Lycoming St. | Lemon Ave. to Brea Canyon Rd. | 25 |
| Montefino Ave. | Grand Ave. to Diamond Bar Blvd. | 25 |
| Pathfinder Rd. | West City Limit to Brea Canyon Rd. North | 45 |
| Pathfinder Rd. | Brea Canyon Rd. North to Brea Canyon Rd. South/ |
40 |
| Pathfinder Rd. | Brea Canyon Rd. South/ |
40 |
| Sunset Crossing Rd. | West City Limit to Diamond Bar Blvd. | 35 |
| Temple Ave. | Diamond Bar Blvd. to Golden Springs Dr. | 45 |
| Valley Vista Dr. | Copley Dr. to Bridgegate Dr. | 35 |
| Via Sorella | Brea Canyon Rd. to Northerly Terminus | 35 |
| Walnut Dr. | West City Limit to Lemon Ave. | 40 |
| Washington St. | Brea Canyon Rd. to Northeast City Limit | 35 |
The prima facie speed which is most appropriate to facilitate the orderly movement of traffic and is a speed limit which is reasonable and safe on all streets other than the streets listed above is 25 mph.
(b) The city engineer is hereby authorized and directed to install appropriate signs upon such portion of each street specified herein giving notice of the primate facie speed limit for each such street declared in this section.
(c) No person shall operate any vehicle in violation of this section.
(Ord. No. 22(1989), §§ 1, 2, 9-19-89; Ord. No. 22A(1989), § 2, 10-1-91; Ord. No. 05(1999), § 12, 5-18-99; Ord. No. 06(2004), § 1, 8-17-04; Ord. No. 01(2011), § 1, 2-1-11; Ord. No. 06(2014), § 1, 7-1-14)
Sec. 10.12.320. - Speed limits when operating vehicles on county grounds.¶
It shall be unlawful for any person to operate or drive any vehicle upon or within the grounds of any public building or institution of the city in any other than a careful and prudent manner, or at a greater rate of speed than is reasonable and proper, or so as to injure the life or limb of any person or the safety of any property, provided that it shall be unlawful to operate or drive any vehicle at a rate of speed in excess of ten miles per hour.
(Ord. No. 14(1989), § 2(15.96.010), 6-27-89)
Secs. 10.12.330—10.12.500. - Reserved.¶
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