ANTIOCH -- A BART strike is uncertain, but there are some East Contra Costa transit closures that motorists should plan for.

All westbound lanes of the freeway will be closed midnight to 3 a.m. overnight Tuesday between the Lone Tree Way/A Street and Somersville Road/Auto Center Drive exits, according to a Contra Costa Transportation Authority news release.

One lane in each direction will be closed between Contra Loma Boulevard/L Street and Hillcrest Avenue overnight Wednesday through Friday.

Both off-ramps at Pittsburg's Loveridge road exit and the eastbound on-ramp will be closed overnight all week.

Locally, all lanes of Somersville/Auto Center will be closed under the freeway from 10 a.m. to 5 a.m. overnight Monday through Friday.

During the day, one lane in both directions of Somersville/Auto Center will be closed from 9 a.m. to 3 p.m. Monday through Friday between Century Boulevard and Delta Fair Boulevard.

For updates, visit http://4eastcounty.org.

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