Motorcycle crash statistics and hotspots in Diamond Bar, CA
- motorcycle crashes, 2021–2026
- 181
- motorcycle crashes, 2021–2026
- serious or fatal
- 36
- serious or fatal
- fatal
- 5
- fatal
- street with the most
- SR-57
- street with the most
Where they cluster
All 10 spots, explained- 1SR-57 & Pathfinder Rd13 crashes · 4 serious or fatalPolice reports: in 5 of 13, a driver drifted out of the lane or onto the wrong side.
- 2SR-60 & Grand Ave12 crashes · 1 serious or fatalPolice reports: in 3 of 12, a driver drove too fast for conditions.
- 3SR-57 & SR-6010 crashes · 2 serious or fatalPolice reports: in 4 of 10, a driver drifted out of the lane or onto the wrong side.
Is Diamond Bar safe to ride a motorcycle?
This page covers traffic crashes, not crime. 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: 181 motorcycle crashes were reported in Diamond Bar from 2021–2026, 36 of them serious or fatal (5 fatal). The most were at SR-57 & Pathfinder Rd (13). 14% involved no other vehicle, usually running wide or losing grip. 23% happened after dark.
Where to look next
How motorcyclists crash in Diamond Bar
- 14% involved no other vehicle, usually running wide or losing grip.
- 23% happened after dark.
- 13% were hit-and-run.
What the reports show about motorcycle crashes in Diamond Bar
- 23% (California: 25%) of crashes happened after dark.
- 100% (California: 80%) were on roads posted 40 mph or faster.
- 20% (California: 28%) left someone seriously hurt or killed.
- The busiest hour was 5 p.m. (California: 5 p.m.).
- 0% (California: 2%) were on a wet road, as the report records it.
- The reports name something about the road itself in 14 crashes: a construction or repair zone (11) and something blocking the road (3).
Set against all motorcycle crashes in California, 2021–2026. Without traffic counts these can't say how risky a street is.
Where motorcycle crashes cluster
Spots with 3 or more reported crashes within about 250 m, worst first.
- 0113 crashes · 4 serious or fatal
SR-57 & Pathfinder Rd
Close passes and cars turning alongside
Police reports: in 5 of 13, a driver drifted out of the lane or onto the wrong side. 6 of 13 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.
- 0212 crashes · 1 serious or fatal
SR-60 & Grand Ave
Close passes and cars turning alongside
Police reports: in 3 of 12, a driver drove too fast for conditions. 6 of 12 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.
- 0310 crashes · 2 serious or fatal
SR-57 & SR-60
Falls and fixed objects
Police reports: in 4 of 10, a driver drifted out of the lane or onto the wrong side. 5 of 10 crashes were a fall or hitting an object, with no other vehicle involved. Traffic is posted at about 65 mph.
- Enter slower than feels necessary and watch for gravel, sand and diesel. Look through the bend.
- Traffic is fast here: at this speed you cross a junction in about a second, so scan early.
- 047 crashes · 3 serious or fatal
SR-57 & Pathfinder Rd
Close passes and cars turning alongside
Police reports: in 3 of 7, a driver drifted out of the lane or onto the wrong side. 5 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.
- 053 crashes · 3 serious or fatal · 1 fatal
SR-57 & 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.
- 066 crashes · 2 serious or fatal
SR-60 & Grand Ave
Riders hit from behind
3 of 6 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.
- 073 crashes · 2 serious or fatal · 1 fatal
SR-57 & Diamond Bar Blvd
A mix of crash types
Traffic is posted at about 55 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.
- 087 crashes · 1 serious or fatal
SR-60 & Prospectors Rd
Close passes and cars turning alongside
4 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. 43% 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.
- 096 crashes · 1 serious or fatal
SR-57 & 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.
- 104 crashes · 2 serious or fatal
SR-57 & Diamond Bar Blvd
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.
Streets with the most motorcycle crashes in Diamond Bar
| Street | Crashes | Serious/fatal |
|---|---|---|
| SR-57 | 80 | 19 |
| SR-60 | 76 | 12 |
| Diamond Bar Blvd | 7 | 0 |
| Golden Springs Dr | 7 | 0 |
Reported motorcycle crashes, 2021–2026, counted by the street each police report names first, so a crash at a corner counts toward one of its two streets. Long, busy streets collect more crashes partly because more people use them.
What the police reports say drivers did in Diamond Bar
| A driver… | Crashes | |
|---|---|---|
| drifted out of the lane or onto the wrong side | 39 | |
| turned or changed lanes when it wasn't clear | 9 | |
| drove too fast for conditions | 8 | |
| didn't yield pulling out of a driveway or alley | 3 | |
| turned from the wrong position | 2 | |
| didn't yield while turning left | 2 |
The other vehicle, where the report names one: 68 cars, 37 SUVs, 24 pickup trucks, 7 minivans and 6 truck or semis.
Reported motorcycle crashes, 2021–2026. The officer names one party and one Vehicle Code section as the main cause of each crash; these are the crashes where that party was a driver. It is the officer's reading at the scene, not a court's finding, and many reports name the person on foot or on a bike instead, which we don't list.
Motorcycle crashes in Diamond Bar by year
| Year | Crashes | Serious/fatal | |
|---|---|---|---|
| 2021 | 31 | 7 | |
| 2022 | 31 | 2 | |
| 2023 | 23 | 6 | |
| 2024 | 29 | 5 | |
| 2025 | 38 | 10 | |
| 2026to Oct 19 | 29 | 6 |
2026 runs to Oct 19, the newest report in the data, and police reports keep arriving for months, so it isn't a full year.
Common questions about Diamond Bar
- Where do the most motorcycle crashes happen in Diamond Bar?
- The worst spot is SR-57 & Pathfinder Rd, with 13 reported motorcycle crashes from 2021–2026, 4 of them serious or fatal. Next are SR-60 & Grand Ave (12) and SR-57 & SR-60 (10).
- How many motorcyclists were killed in Diamond Bar?
- 5 crashes killed someone in 181 reported motorcycle crashes in Diamond Bar from 2021–2026, and 36 left someone seriously hurt or killed.
- How do motorcyclists usually crash in Diamond Bar?
- 14% involved no other vehicle, usually running wide or losing grip. 23% happened after dark. 13% were hit-and-run.
- When and where do motorcycle crashes happen in Diamond Bar, compared with California?
- Of 181 reported motorcycle crashes in Diamond Bar from 2021–2026: 23% (California: 25%) of crashes happened after dark. 100% (California: 80%) were on roads posted 40 mph or faster. 20% (California: 28%) left someone seriously hurt or killed. The busiest hour was 5 p.m. (California: 5 p.m.). 0% (California: 2%) were on a wet road, as the report records it. The reports name something about the road itself in 14 crashes: a construction or repair zone (11) and something blocking the road (3).
- Which streets in Diamond Bar have the most motorcycle crashes?
- By the street each police report names first, 2021–2026: SR-57 (80), SR-60 (76), Diamond Bar Blvd (7), Golden Springs Dr (7). Long, busy streets collect more crashes partly because more people use them.
- How many motorcycle crashes happen in Diamond Bar each year?
- Reported motorcycle crashes with map locations: 2021: 31, 2022: 31, 2023: 23, 2024: 29, 2025: 38, 2026 (through Oct 19): 29. 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. A report with no coordinates is placed at the intersection its street names give; reports with neither are not counted, so the real totals are higher.
Nearby cities
Source: California Crash Reporting System (CCRS), 2021–2026. A report with no coordinates is placed at the intersection its street names give; reports with neither are not counted, 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 2026-10-22. How the data works.