Alternating Lane Closure Scheduled for Eastbound and Westbound State Route 4 (SR-4) Between San Pablo Avenue/I-80 and SR-242 in Contra Costa County

Motorists are advised to check Quickmap.dot.ca.gov for the latest updates on closures

Contra Costa County - Caltrans will continue overnight alternating lane closures on eastbound and westbound State Route 4 (SR-4) between I-80/San Pablo Avenue in Hercules and State Route 242 (SR-242) in the city of Concord to complete striping and paving operations along the highway. Work is scheduled to continue through June 2026.

These closures support ongoing roadway improvements including pavement work, striping, and traffic-safety enhancements along the SR-4 corridor. All work is weather-dependent and subject to change.

Closure Hours:

• Westbound (WB): SR-242 to I-80, 7:00 PM - 6:00 AM (Monday-Friday)
• Eastbound (EB): San Pablo Avenue to I-680, 7:00 PM - 7:00 AM (Monday-Friday)

What motorists can expect:

• Alternating Lane closures
• Shifting traffic patterns
• Possible delays-drivers are encouraged to allow extra travel time

**All work is weather dependent and subject to change**

Changeable message signs (CMS) will be posted throughout the corridor to assist drivers.

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.