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This project provides new HOV lanes on I-680 in the northbound direction from State Route (SR) 242 in Concord to the Marina Vista Interchange in Martinez and in the southbound direction from the Marina Vista Interchange in Martinez to North Main Street in Walnut Creek. The project also provides a collector-distributor road system on I-680 for movements to and from SR 4 at the I-680/ SR 4 Interchange.
This project was accomplished by minor widening of the right hand shoulders and re-striping of the existing I-680 lanes to a combination of 11-foot and 12-foot wide lanes. Several structures required widening.