Alameda County, CA
I-680/SR84 Interchange Improvements and SR 84 Widening
The project will widen 4 miles of SR 84 to four lanes and convert the facility to expressway standards, widen one mile of I-680 to extend the existing southbound express lane, and reconstruct the I-680/SR 84 interchange ramps. Improvements include pavement widening, new auxiliary lanes, new and widened bridges, extensive retaining walls, drainage upgrades, bicycle facilities, overhead sign structures, new signalized intersection, safety lighting and toll system upgrades.