This calculator allows users to estimate the 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)). The calculator applies only to Caltrans-managed facilities with Federal Highway Administration (FHWA) functional classifications of 1, 2 or 3 (see Caltrans, 2019). That corresponds to interstate highways (class 1), other freeways and expressways (class 2), and other principal arterials (class 3).
To obtain an induced VMT estimate for a roadway capacity expansion project, enter the project length (in lane miles added) and geography (MSA for additions to interstates; county for additions to other Caltrans-managed class 2 or 3 facilities).More about this calculator
currently has of on which vehicle miles are travelled per year.
A project adding would induce an additional vehicle miles travelled per year.
This calculation is using an elasticity of .
We do not have enough baseline data for the Napa MSA to estimate induced VMT.
does not have enough miles of interstate highway to use this calculator.