This calculator allows users to estimate the vehicle miles of travel (VMT) induced annually as a result of adding general-purpose or high-occupancy-vehicle (HOV) lane miles to roadways managed by the California Department of Transportation (Caltrans) in one of California’s urbanized counties (counties within a metropolitan statistical area (MSA)).
Calculator use is not appropriate in all circumstances or for all purposes, however. See the "About" page for further details.