Accident
Moderate Severity
Stale
CHP : Traffic Collision on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays.
A injury accident was reported on CA-4 W near Contra Costa on May 31, 2026 at 2:20 PM.
Last Updated
1 hour, 39 minutes ago
May 31, 7:45 AM
Coordinates
37.8903, -121.5694
Update History
4 observations
CHP : Traffic Collision on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays.
May 31, 7:30 AM
CHP : Traffic Collision on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays.
May 31, 6:30 AM
CHP : Traffic Collision on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays.
May 31, 6:00 AM
CHP : Traffic Collision on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays.
May 31, 5:45 AM
Source: 511_sfbay · ID 511.org/1501697
First seen May 31, 2026 5:45 AM