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.