I-680 Auxiliary Lane Improvement Project 

What is an Auxiliary Lane?

Auxiliary lanes are lanes that run along the freeway from on-ramp of one interchange to the off-ramp of the next, but do not continue through the interchange area.  Auxiliary lanes improve traffic flow and reduce congestion by eliminating back-ups that occur when cars merge on and off the freeway between interchanges.  They also enable local traffic to use the freeway without entering the main traffic flow.

The Contra Costa Transportation Authority (CCTA), Caltrans, the Town of Danville and the City of San Ramon are pleased to announce that substantial progress has been made on I-680 Auxiliary Lanes Improvement Project.  The new auxiliary lanes on I-680 in San Ramon between Bollinger Canyon Road and Crow Canyon Road, as well as in Danville between Diablo Road and Sycamore Valley Road have already been opened to traffic.  In addition, pedestrian access along the Iron Horse Trail at Laurel Drive in Danville has been restored and the detour has been removed.

The landscaping construction is expected to be completed in May 2008 with a five-year Plant Establishment Period to follow.  The term of the Agreement should be extended to provide the required construction management services for the landscaping construction and at least the first year of the total Plant Establishment Period. Staff recommends extending the term of Agreement No. 199 to June 30, 2009.  Budget to perform this task is already included in the Agreement.

For more information

If you would like more information on the I-680 Auxiliary Lanes Improvement Project, please call the project information line at (925) 300-7107.

You will need the Adobe Acrobat Reader to view and print PDF files. Click here to get the Reader.  If you are unable to download these documents, please contact us via e-mail at transportation@sanramon.ca.gov or telephone (925) 973-2650. 

We also encourage any visually impaired users who are unable to view the PDF documents to visit Access.Adobe.com, the site contains tools that can convert PDF documents into simple HTML or ASCII text which standard screen reading programs can then synthesize the HTML as audible speech.  Thank you.