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. That corresponds to interstate highways (class 1), other freeways and expressways (class 2), and other principal arterials (class 3).

How to Use

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


1. Select facility type