Bike crashes on Sierra Ave, Fontana

We don't rate streets 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. This page covers traffic crashes, not crime. What the records show: 27 bike crashes were reported on Sierra Ave in Fontana from 2021–2026, 3 of them serious or fatal. The most were at Sierra Ave & Foothill Blvd (4). 67% were side-impact crashes at junctions (drivers pulling out or turning across). 48% happened after dark.

• The worst spot, on the mapSierra Ave & Foothill Blvd4 crashes. Side-impact crashes at the junction.
• Next in FontanaCitrus Ave22 bike crashes, 2021–2026
• The whole cityBike hotspots in Fontana244 bike crashes, 2021–2026

• 67% were side-impact crashes at junctions (drivers pulling out or turning across).
• 48% happened after dark.
• 22% were hit-and-run.

1. Sierra Ave & Foothill Blvd

   4 crashes · 1 serious or fatal

   Side-impact crashes at the junction

   3 of 4 crashes were broadside: a vehicle hit at an angle, usually a driver pulling out of a side street or driveway, turning across, or running the signal. Traffic is posted at about 40 mph.

   • Slow down approaching the junction, watch drivers' front wheels at side streets and driveways, and don't assume a driver waiting to turn has seen you.
   • Traffic is fast here. A quieter parallel street is often worth the extra minutes.
   See it on the map

2. Sierra Ave & Slover Ave

   3 crashes · 1 serious or fatal

   Side-impact crashes at the junction

   3 of 3 crashes were broadside: a vehicle hit at an angle, usually a driver pulling out of a side street or driveway, turning across, or running the signal. 100% happened after dark. Traffic is posted at about 50 mph. 67% were hit-and-run.

   • Slow down approaching the junction, watch drivers' front wheels at side streets and driveways, and don't assume a driver waiting to turn has seen you.
   • Use a front and rear light, even on lit streets.
   • Traffic is fast here. A quieter parallel street is often worth the extra minutes.
   See it on the map

3. Sierra Ave & Valley Blvd

   4 crashes

   Side-impact crashes at the junction

   2 of 4 crashes were broadside: a vehicle hit at an angle, usually a driver pulling out of a side street or driveway, turning across, or running the signal. 50% happened after dark. Traffic is posted at about 40 mph.

   • Slow down approaching the junction, watch drivers' front wheels at side streets and driveways, and don't assume a driver waiting to turn has seen you.
   • Use a front and rear light, even on lit streets.
   • Traffic is fast here. A quieter parallel street is often worth the extra minutes.
   See it on the map

4. Sierra Ave & Marygold Ave

   4 crashes

   Side-impact crashes at the junction

   3 of 4 crashes were broadside: a vehicle hit at an angle, usually a driver pulling out of a side street or driveway, turning across, or running the signal. 50% happened after dark.

   • Slow down approaching the junction, watch drivers' front wheels at side streets and driveways, and don't assume a driver waiting to turn has seen you.
   • Use a front and rear light, even on lit streets.
   See it on the map

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

The busiest hour was 4 p.m..

Where on Sierra Ave do the most bike crashes happen?

Sierra Ave & Foothill Blvd, with 4 reported bike crashes from 2021–2026, 1 of them serious or fatal. Next are Sierra Ave & Slover Ave (3) and Sierra Ave & Valley Blvd (4).

How do cyclists usually get hit on Sierra Ave?

67% were side-impact crashes at junctions (drivers pulling out or turning across). 48% happened after dark. 22% were hit-and-run.

How many bike crashes happen on Sierra Ave each year?

Reported bike crashes on Sierra Ave in Fontana: 2021: 3, 2022: 4, 2023: 3, 2024: 7, 2025: 4, 2026: 6. 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, counted by the street each report names first. Only crashes reported with map coordinates are counted, so the real totals are higher.