ANTIOCH -- Drivers on Highway 4 should expect delays this weekend as construction work will close all lanes in the early morning hours Saturday and Sunday.

As work continues to widen the highway to eight lanes through Antioch, the contractor will be removing temporary supports from the G Street bridge over the highway, according to a Caltrans news release.

Highway 4 will be closed between Contra Loma Boulevard and Lone Tree Way on Saturday morning from midnight to 3 a.m. westbound and midnight to 4 a.m. eastbound.

Sunday morning's closure will be at the same location from 2 to 5 a.m. westbound and 2 to 6 a.m. eastbound.

Westbound drivers will be detoured at Lone Tree to 18th Street and back on the freeway at L Street. Eastbound motorists will be detoured at Contra Loma and down Fitzuren Road and Putnam Street to Lone Tree.

Motorists are advised to expect delays and allow extra time for the drive.

For information on all Highway 4 closures, visit http://widensr4.org.

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