New Highway 4 Off-Ramp at Somersville

As part of the widening of Highway 4, traffic flow through Pittsburg and Antioch will undergo two significant modifications during the week of February 20.

The switch to the new eastbound off-ramp at Somersville Road, which was planned for Friday, February 24, 2012, has been cancelled. The planned closure of the eastbound highway and Somersville Road for Thursday night is also cancelled. This work will be rescheduled in the near future. Traffic will remain on the existing temporary off-ramp until that time.

The planned work on westbound SR-4 at Century Boulevard is still planned as follows: On Saturday, February 25, 2012, traffic flow on SR-4 at Century Boulevard will be modified. Westbound traffic will be shifted to the north over a portion of the newly constructed Century Boulevard Bridge.

In order to perform this lane shift, all westbound lanes of SR-4 will be closed from Somersville Road to Loveridge Road on Wednesday and Thursday nights between 10:00 pm and 3:30 am, and on Friday night between 11:00 pm and 5:00 am. The westbound on-ramp from Somersville Road will also be closed between 10:00 pm and 5:00 am on Wednesday and Thursday nights and between 11:00 pm and 6:00 am on Friday night.

Motorists are advised to expect delays and allow extra time for their commute. Signs will be in place at the closures to direct motorists to alternate routes. Please be alert and carefully follow all directional signs when encountering detours.

Caltrans and CCTA appreciate your patience as we work to improve the highways. For the most current information on all SR-4 corridor closures please visit our web site at:

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