I-680 Improvements Coming in Spring 2013

New auxiliary lanes expected to help with traffic flow

The final phase of the I-680 Auxiliary Lanes Project is a collaboration between the Town of Danville and the Contra Costa Transportation Authority.

The auxiliary lanes will be exclusive lanes that connect the entrance and exit ramps between the Sycamore Valley Road and Crow Canyon Road interchanges on I-680, in both directions. When completed, the auxiliary lanes will help reduce traffic congestion and increase safety for commuters.

The first phase of the project – which constructed auxiliary lanes from Diablo Road to Sycamore Valley Road in Danville and from Crow Canyon Road to Bollinger Canyon Road to in San Ramon – was completed in 2006.

This segment is the last phase of a project originally identified in 1988 as a part of Contra Costa’s ½-cent transportation sales tax measure.

Preparation work on the project, which includes tree removal prior to bird nesting season, will take place during winter 2012. Construction is expected to get underway in spring 2013. The project will be managed by Caltrans with oversight by the Contra Costa Transportation Authority.