ANTIOCH -- The demolition of the old Highway 4 overpass that crosses over Contra Loma Boulevard highlights this week's construction on the freeway.

All lanes of Contra Loma/L will be closed crossing under the highway from midnight to 5 a.m. overnight Thursday and Friday to ensure crew and public safety during the work to remove the inactive portion of the structure, according to a Caltrans news release.

The Contra Loma closures will continue on Monday and Tuesday if necessary.

Northbound traffic will be detoured down Fitzuren Road and G Street, and left on 18th Street to L. Southbound drivers will be detoured onto Highway 4 to the Somersville Road/Auto Center Drive exit and Buchanan Road to Contra Loma.

Additionally, a single lane of Somersville/Auto Center will be closed between Century Boulevard and Delta Fair Boulevard 9 a.m. to 3 p.m. Monday through Friday.

Other Highway 4 lane closures include a single eastbound lane between Contra Loma/L and Lone Tree Way/A Street from 11 p.m. to 6 a.m. overnight Monday through Friday. A lane in the opposite direction will be closed 9 p.m. to 4 a.m. on those days.

For more information, visit www.4eastcounty.org.

Contact Paul Burgarino at 925-779-7164. Follow him at Twitter.com/paulburgarino.



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