State Route 4 Widening
The Contra Costa Transportation Authority, in cooperation with the Federal Highway Administration and the California Department of Transportation, proposes to widen State Route 4 (SR 4), its interchanges, and affected local roadways from approximately 1.3 kilometers (0.8 mile) west of Loveridge Road to approximately 1.2 kilometers (0.7 mile) east of Hillcrest Avenue.
The proposed project would consist of the following actions:
- Widen SR 4 from the existing four lanes to eight lanes. The widened freeway would consist of one HOV lane and three mixed-flow lanes in each direction.
- Preserve sufficient width in the SR 4 median through the Hillcrest Interchange to accommodate a possible future public transit improvement (by others).
- Reconstruct SR 4 interchanges to accommodate the freeway widening at:
- Loveridge Road
- Somersville Road
- Contra Loma Boulevard-L Street
- Lone Tree Way-A Street
- Hillcrest Avenue
- Eliminate partial interchange at G Street and reconstruct the overcrossing.
- Add auxiliary lanes between interchanges from SR 4 on-ramps to off-ramps.
- Provide capability to add ramp metering facilities including high occupancy vehicle (HOV) preferential lanes and California Highway Patrol (CHP) enforcement areas where feasible.
- Widen the Roosevelt Lane Pedestrian Undercrossing and the Cavallo Road Undercrossing.
- Extend drainage facilities that cross SR 4 in the project area.
Project Fact Sheets:
- Bailey Road to Railroad Avenue (Completed) [PDF - 72 KB]
- Railroad Rd to Loveridge Rd (Completed) [PDF - 23 KB]
- Loveridge Rd to Somersville Rd [PDF-166 KB]
- Somersville Rd to SR160 [PDF-220 KB] [PDF - 157 KB]
News from State Route 4!
Commuters on State Route 4 through Antioch are watching traffic relief as it is being built alongside the highway. State Route 4 is being widened from 4 to 8 lanes as part of an investment in the infrastructure of East Contra Costa County totaling over a billion dollars. One lane in each direction will be dedicated to car pools. But major traffic relief will also be felt when the new eBart line is constructed. The project will add 10 miles of eBART track from Pittsburg Bay Point to a new Hillcrest station in Antioch. The groundbreaking for that station occurred in October 2012.
Together, the highway and BART projects are a joint project between the Contra Costa County Transportation Authority (CCTA), the California Department of Transportation (Caltrans), the Metropolitan Transportation Commission, the California Transportation Commission, and the Federal Highway Administration. CCTA is funding about $272 million of the project through Measure J, a half-cent sales tax reauthorized by Contra Costa voters in 2004, and $66 million of the project through the previous Measure C.
The investment in East County represented by the SR-4 Corridor projects will not only provide state-of-the-art transportation and transit infrastructure, but will also act as a catalyst for further economic growth, sustainable land-use development, and improved quality of life for the region's 225,000 residents.
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