SBCAG and Caltrans have undertaken widening 16 miles of Highway 101, known as Highway 101: Santa Barbara to
Mussel Shoals, to add carpool lanes and address a narrow portion of Highway 101 that currently has two
lanes in each direction. The project is phased as depicted on the Project Location Map below. Phases 1 and 2 are
complete. Phase 3 is in construction, and Phase 4 is planned to begin in 2020.
Between Santa Barbara and Mussel Shoals, Highway 101 is being expanded to include new carpool lanes and operational improvements. The phases are color coded above.