Accident
High Severity
Resolved
CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound at Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays.
A high-severity accident was reported on CA-4 W near Contra Costa on August 14, 2026 at 1:36 AM.
Last Updated
2 months, 1 week ago
Aug 13, 9:15 PM
Coordinates
37.9615, -121.7428
Update History
3 observations
CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound at Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays.
Aug 13, 8:45 PM
CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound at Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays.
Aug 13, 8:30 PM
CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound at Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays.
Aug 13, 6:45 PM
Source: 511_sfbay · ID 511.org/1535311
First seen Aug 13, 2026 6:45 PM