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Data last rebuilt 2026-09-22

Motorcycle crash hotspots in Diamond Bar, CA

148 motorcycle crashes were reported in Diamond Bar from 2021–2025, 30 of them serious or fatal (4 fatal). Below are the spots where they keep happening, what usually goes wrong at each one, and what to watch for.
motorcycle crashes, 2021–2025
148
motorcycle crashes, 2021–2025
serious or fatal
30
serious or fatal
fatal
4
fatal
Open Diamond Bar on the mapPedestrian crash hotspots in Diamond Bar(54 crashes)Bike crash hotspots in Diamond Bar(24 crashes)

Is Diamond Bar safe to ride a motorcycle?

We don't rate cities as safe or unsafe: crash counts can't say how risky a street is, and busy streets have more crashes partly because more people use them. What the records show: 148 motorcycle crashes were reported in Diamond Bar from 2021–2025, 30 of them serious or fatal (4 fatal). The most were at SR-60 (Pomona Fwy) & Grand Ave (11). 13% involved no other vehicle, usually running wide or losing grip. 26% happened after dark.

How motorcyclists crash in Diamond Bar

  • 13% involved no other vehicle, usually running wide or losing grip.
  • 26% happened after dark.
  • 14% were hit-and-run.

Where motorcycle crashes cluster

Spots with 3 or more reported crashes within about 250 m, worst first.

  1. 0111 crashes · 1 serious or fatal

    SR-60 (Pomona Fwy) & Grand Ave

    Close passes and cars turning alongside

    6 of 11 crashes were sideswipes: a vehicle alongside, typically a close pass, a right hook, or an opening car door. Traffic is posted at about 65 mph.

    • Don't linger in drivers' blind spots, and watch for cars changing lanes or turning into driveways alongside you.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  2. 023 crashes · 3 serious or fatal · 1 fatal

    SR-57 To SR-60 & Golden Springs Dr

    A mix of crash types

    Traffic is posted at about 65 mph.

    • No single crash pattern stands out here. Ride within your sight distance and keep extra space.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  3. 037 crashes · 2 serious or fatal

    SR-57 (Orange Fwy) & Pathfinder Rd

    Close passes and cars turning alongside

    3 of 7 crashes were sideswipes: a vehicle alongside, typically a close pass, a right hook, or an opening car door. Traffic is posted at about 65 mph.

    • Don't linger in drivers' blind spots, and watch for cars changing lanes or turning into driveways alongside you.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  4. 046 crashes · 2 serious or fatal

    SR-57 (Orange Freeway) & Pathfinder Rd

    Close passes and cars turning alongside

    4 of 6 crashes were sideswipes: a vehicle alongside, typically a close pass, a right hook, or an opening car door. Traffic is posted at about 65 mph.

    • Don't linger in drivers' blind spots, and watch for cars changing lanes or turning into driveways alongside you.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  5. 056 crashes · 1 serious or fatal

    SR-57 (Orange Fwy) & Pathfinder Rd

    Close passes and cars turning alongside

    3 of 6 crashes were sideswipes: a vehicle alongside, typically a close pass, a right hook, or an opening car door. Traffic is posted at about 65 mph. 33% were hit-and-run.

    • Don't linger in drivers' blind spots, and watch for cars changing lanes or turning into driveways alongside you.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  6. 064 crashes · 2 serious or fatal

    SR-57 (Orange Fwy) & SR-60 (Pomona Fwy)

    Close passes and cars turning alongside

    2 of 4 crashes were sideswipes: a vehicle alongside, typically a close pass, a right hook, or an opening car door. Traffic is posted at about 65 mph.

    • Don't linger in drivers' blind spots, and watch for cars changing lanes or turning into driveways alongside you.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  7. 075 crashes · 1 serious or fatal

    SR-60 (Pomona Fwy) & Grand Ave

    Riders hit from behind

    2 of 5 crashes were rear-end: hit from behind. Traffic is posted at about 65 mph.

    • Check your mirrors when slowing, flash your brake light, and leave an escape gap when you stop in traffic.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  8. 085 crashes · 1 serious or fatal

    SR-57 (Orange Fwy) & SR-60 (Pomona Fwy)

    Riders hit from behind

    4 of 5 crashes were rear-end: hit from behind. Traffic is posted at about 65 mph.

    • Check your mirrors when slowing, flash your brake light, and leave an escape gap when you stop in traffic.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  9. 095 crashes · 1 serious or fatal

    SR-60 (Pomona Fwy) & Prospectors Rd

    Close passes and cars turning alongside

    3 of 5 crashes were sideswipes: a vehicle alongside, typically a close pass, a right hook, or an opening car door. Traffic is posted at about 65 mph. 60% were hit-and-run.

    • Don't linger in drivers' blind spots, and watch for cars changing lanes or turning into driveways alongside you.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map
  10. 104 crashes · 1 serious or fatal

    SR-60 (Pomona Fwy) & Grand Ave

    Riders hit from behind

    2 of 4 crashes were rear-end: hit from behind. Traffic is posted at about 65 mph.

    • Check your mirrors when slowing, flash your brake light, and leave an escape gap when you stop in traffic.
    • Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
    See it on the map

Motorcycle crashes in Diamond Bar by year

YearCrashesSerious/fatal
2021287
2022312
2023226
2024295
20253810

Common questions about Diamond Bar

Where do the most motorcycle crashes happen in Diamond Bar?
The worst spot is SR-60 (Pomona Fwy) & Grand Ave, with 11 reported motorcycle crashes from 2021–2025, 1 of them serious or fatal. Next are SR-57 To SR-60 & Golden Springs Dr (3) and SR-57 (Orange Fwy) & Pathfinder Rd (7).
How many motorcyclists were killed in Diamond Bar?
4 crashes killed someone in 148 reported motorcycle crashes in Diamond Bar from 2021–2025, and 30 left someone seriously hurt or killed.
How do motorcyclists usually crash in Diamond Bar?
13% involved no other vehicle, usually running wide or losing grip. 26% happened after dark. 14% were hit-and-run.
How many motorcycle crashes happen in Diamond Bar each year?
Reported motorcycle crashes with map locations: 2021: 28, 2022: 31, 2023: 22, 2024: 29, 2025: 38. The latest year can rise as late reports come in.
Where does this data come from?
Police crash reports in the California Crash Reporting System (CCRS), published by the state on data.ca.gov. Only crashes reported with map coordinates are counted, so the real totals are higher.

Nearby cities

City of IndustryLa PuentePomonaBreaSan DimasWest CovinaGlendoraChino Hills

Source: California Crash Reporting System (CCRS), 2021–2025. Only crashes reported with map coordinates are counted, and many city police reports have none, so these numbers are lower than the real total. Freeway crashes are included: many motorcycle crashes in cities happen on them. Busy streets show more crashes partly because more people use them. Data last rebuilt 2026-09-22. How the data works.