Overnight Full Closures on State Route 4 (SR-4) in Contra Costa County Martinez Area – Alhambra Avenue to Interstate 80

Contra Costa County — Caltrans will continue overnight paving and maintenance work on eastbound and westbound State Route 4 (SR-4) between Cummings Skyway and Alhambra Avenue / Interstate 80 in Martinez. Work will take place nightly beginning November 5, 2025, through November 8, 2025, weather permitting. Closures will occur between 7:00 PM and 5:00 AM Monday through Saturday.

Updated Closure Schedule:

• SR-4 EB I-80 → Cummings Skyway: November 5th
• SR-4 EB Cummings Skyway → Alhambra: November 6th - 8th

**Please note this schedule is tentative and subject to change depending on weather conditions and construction progress.**

Detour Plan For EB SR-4 Traffic from I-80 to Cummings Skyway
November 5th

1. Continue EB 80 to Cummings Skyway Exit
2. Exit on Cummings Skyway Rd.
3. Right on Cummings Skyway Rd.
4. Right on EB Hwy 4 Onramp

**Be advised reverse one-way traffic control and temporary traffic signal near I-80 at Cummings Skyway Overcrossing **

Detour Plan for EB SR-4 traffic from Cummings Skyway to Alhambra
November 6th-8th

1. Exit Cummings Skyway Offramp.
2. Left on Cummings Skyway
3. Right on Franklin Canyon Rd.
4. Left on Alhambra Ave.
5. Right on EB 4 Onramp

Please follow posted signs and detour routes during the closure periods. Motorists are advised to expect delays, reduce speed in the construction zone, and allow extra travel time.

Caltrans appreciates the public’s patience while we complete this important roadway improvement work.

Motorists are advised to expect delays and allow extra time.
For 24/7 traffic updates, follow 511.org on Twitter.
For real-time traffic, visit Caltrans QuickMap.

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