SONOMA-Marin Multi-modal Transportation & Land Use Study


Sonoma and Marin Counties, California

The Sonoma/Marin Multimodal Transportation and Land Use Study, led by HDR | Calthorpe, took a comprehensive look at land use and travel patterns in the Northern San Francisco Bay Area to devise a balanced, multi-modal transportation system that incorporates a variety of travel modes and transit-supportive development scenarios.

The study explored compact, mixed-use development around a cost-effective transit system as a means of tackling increasing highway congestion and urban sprawl. Preferred development scenarios incorporate improvements such as High Occupancy Vehicle lanes, commuter rail service, and bike trails into the North Bay’s transportation network, emphasizing land uses that promote transit use and reduce reliance on the automobile.

Opportunity sites along proposed rail corridor

Project Summary



Sonoma County Transportation Authority (Santa Rosa, California) & Marin Countywide Planning Agency (Marin, California)


Regional Plan


Multi Modal Transportation and Land-Use study for a 54 mile (87 km) corridor