Crash on Diamond Bar Blvd at RT 57 Nbon/R (N), Diamond Bar, California

Sunday, September 20, 2026 at 5:46 PM

Property damage only2 vehicles

Reporting agency: Los Angeles County Sheriff's Office
Report number: 926-06093-2929-472

From the CHP CCRS, record last updated October 25, 2026. No changes since first published.

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Who can ask: Parties of proper interest under Vehicle Code 20012: drivers, passengers, injured persons, vehicle and property owners, and their attorneys and insurers. There is no public copy.

Los Angeles County Sheriff's Office: phone (562) 345-4441; address Records and Identification Bureau, 12440 East Imperial Highway, Suite 120, Norwalk, CA 90650; its request page is linked below.

We publish the state's public crash data. The full officer's report is sold by the state or the agency; we do not hold or sell it.

Where and when

Location: Diamond Bar Blvd at RT 57 Nbon/R (N)
City, county: Diamond Bar, Los Angeles County
Collision type: Side Swipe
Motor vehicle involved with: Motor Vehicle on Other Roadway
Posted speed limit: 35 mph
Primary collision factor cited: No
Weather: Clear
Light: Daylight
Road surface: No Unusual Conditions
Hit and run: No
People involved: 3
Injured: 0
Killed: 0

Vehicles and people

Damage area not recorded

Unit 1: 2023 Jeep Grand Cherokee

White Passenger Car Station Wagon Jeep

Direction of travel: West
Maneuver: Proceeding Straight

Driver, female, 39Restraint: Occupant Lap Shoulder Harness Not Used. Airbag: Air Bag Deployed
Not injured
Passenger, female, 65Restraint: Occupant Lap Shoulder Harness Not Used. Airbag: Air Bag Deployed
Not injured

Damage area not recorded

Unit 2: 2021 Mazda CX-5

Black Passenger Car Station Wagon Jeep

Direction of travel: North
Maneuver: Proceeding Straight

Driver, male, 72Restraint: Occupant Lap Shoulder Harness Not Used. Airbag: Air Bag Deployed
Not injured

What the officer recorded

Violation cited: 21453(a)as recorded on the report
Unit 1 contributing factor: ENTERING OR LEAVING RAMPas recorded on the report
Unit 1 driver condition: CELL PHONE USE UNKNOWNas recorded on the report

A contributing factor or charge recorded by an officer is not a finding of fault or a conviction. We show the record as the state released it.

Nearby and recent

50 crashes recorded on Diamond Bar Blvd in Diamond Bar in the last 12 months, 24 with injuries.

Oct 19, 2026, SR-57 N/B (Orange Fwy) at Diamond Bar Boulevard Undercrossing2 vehiclesProperty damage only
Oct 14, 2026, SR-57 N/B (Orange Fwy) at Pathfinder Road2 vehiclesProperty damage only
Oct 14, 2026, SR-57 N/B (Orange Fwy) to Pathfinder Rd. at Pathfinder Road2 vehiclesProperty damage only
Oct 11, 2026, SR-57 N/B (Orange Fwy) at Diamond Bar Blvd1 vehicleProperty damage only
Oct 9, 2026, SR-57 S/B (Orange Fwy) at Diamond Bar Blvd2 vehicles, 2 injuredInjury crash

All Diamond Bar crashes, September 2026

About this record

Source: CHP CCRS
Updates: Changes the state makes to this record are applied here when the source publishes them
First published here: October 25, 2026
Last updated: October 25, 2026, no changes recorded
What is left out: Names, addresses, plates, and license and insurance numbers are not in the public data and never appear here

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