Contra Costa Transportation Authority
ENVIRONMENTAL AND ENGINEERING SERVICES FOR STATE ROUTE 4 ( SR- 4) OPERATIONAL IMPROVEMENTS PROJECT WESTBOUND PHASE 1 SR- 4 is a major freeway which connects the communities in East Contra Costa County to the San Francisco Bay Area. The segment between the SR- 4/Interstate 680 ( I- 680) Interchange and the Bailey Road Interchange experiences significant directional peak period traffic congestion that is expected to deteriorate in the future. The westbound ( WB) direction experiences congestion during the mo
environmental and engineering services for state route 4 sr4 operational improvements project westbound phase 1
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