Interstate 680 Northbound Express Lane Completion Project

As a major north-south freeway, I-680 is a heavily traveled corridor that connects the Southern San Francisco Bay Area with Interstate 80 and passes through Santa Clara, Alameda, Contra Costa, and Solano counties. Within Contra Costa county, travelers experience congestion, traffic bottlenecks within the corridor, and increased travel times. The Project proposes to construct a northbound express lane from Livorna Road to State Route (SR-) 242 and convert the existing northbound High Occupancy Vehicle (HOV) lane from SR-242 to north of Arthur Road near Martinez to an express lane. the Project has four build alternatives (1C, 2, 3, and 5) and one no build alternative. Alternative 2 has been identified as the Preferred Alternative. The Project is located within Alamo, Walnut Creek, Concord, Pleasant Hill, and Martinez on I-680.