Active Studies

Corridor System Management Plans
As part of the passage of Proposition 1B in November 2006, the Corridor Mobility Improvement Account (CMIA) was created by the California Transportation Commission (CTC). The CTC requires Caltrans to develop Corridor System Management Plans (CSMPs) for highway corridors containing projects slated to receive CMIA funds. CSMPs are designed to identify ways to increase transportation options, improve system efficiency, and reduce congestion in some of the State's most challenging travel corridors. In Contra Costa County, three CMIA-funded projects have spurred the generation of CSMPs: Caldecott T... more
Interstate 680 Transit Investment and Congestion Relief Options Study

Posted December 17, 2015.

The I-680 Transit Investment and Congestion Relief Options Study was initiated in April 2015 and finalized in December 2015. The primary purpose of the Study was to define and evaluate potential transportation investment options that could reduce traffic congestion and encourage transit ridership on the I-680 corridor in the general area from the Benicia-Martinez Bridge to State Route-84 with a focus on potential transit service improvement options between Walnut Creek and Dublin.

The study evaluated fi... more

State Route 239 Corridor Study

SR-239 is a legislatively approved, but unconstructed route in the California state highway system. The purpose of this study is to determine the ultimate concept and alignment for the route in the context of the regional transportation network that includes part of three counties: Contra Costa, San Joaquin and Alameda. This route has the potential to provide improved regional connectivity, job realization, congestion relief, and roadway safety & emergency access. Contra Costa County was awarded $14 million for initial study and planning under SAFETEA-LU in 2005. Administration of the s... more

West County High Capacity Transit Study

Interstate 80 is one of the most congested corridors in the Bay Area, and the Richmond BART line often reaches full capacity during commute hours. The West County High-Capacity Transit Study is evaluating options for major transit investments in the I-80 corridor of West Contra Costa County. The Study is focused on rapid and direct services that can attract new riders among the 250,000 residents of West County and can be a competitive alternative to driving. The ultimate goal of the Study is to identify one or more projects to improve high-capacity transit in West County, expand altern... more

Mokelumne Trail Bicycle/Pedestrian Overcrossing
The Mokelumne Trail Bicycle/Pedestrian Overcrossing project will construct a pedestrian and bicycle overcrossing near the Mokelumne Trail at Highway 4. The overcrossing will include a multi-span bridge with a column in the Highway 4 median. Bridge approaches will be constructed on earthen embankments. The path will be approximately 16 feet wide. The Mokelumne Trail runs from the Martinez Regional Shoreline to the north and Oakland/Jack London Square shoreline in the west. The eastern boundary is located in Antioch where the Delta meets the San Francisco Bay, and Brentwood near the Contra Costa... more