ANTIOCH -- All eastbound lanes of Highway 4 through Antioch will be closed early Thursday morning as construction continues to widen the road.

Lanes between Somersville Road and Lone Tree Way will be closed between midnight and 5 a.m., as the contractor will be paving concrete in the median, according to a Caltrans news release

Closing the road ensures the safety of the crew, Caltrans said.

Motorists will be detoured off the freeway at Somersville and down Fitzuren Road and Putnam Street before merging back on at Lone Tree.

Drivers should expect delays and allow extra commute time.

For construction updates, visit http://widensr4.org.

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