SB 743 (Steinberg, 2013) updates the way transportation impacts are measured as part of the California Environmental Quality Act (CEQA) for new development projects. Lead agencies are now required to analyze Vehicle Miles Traveled (VMT) as part of the transportation impact analysis requirements under CEQA. To support local lead agencies to meet these requirements, TAM has developed an activity-based model, the TAM Demand Model (TAMDM) (LINK?) to provide estimates of existing and forecasted VMT per capita in Marin County.

The webmap in the tab below provides existing (2015) and forecasted (2040) estimates of VMT per capita (residential and employment) for traffic analysis zones and micro analysis zones in TAMDM. Lead agencies have the discretion to determine the most appropriate methodology to evaluate a project ‘s VMT and may revise estimates to reflect professional judgment based on substantial evidence.