The identification of traffic volumes is a primary component towards tracking mobility with the Tahoe Region. Published traffic volumes are counted annually within the Lake Tahoe Region by both the California Department of Transportation (Caltrans) the Nevada Department of Transportation (NDOT) and local governmental jurisdictions. In addition to modeling compliance with the 1981 VMT Threshold, TRPA staff utilized the 1981 base year VMT estimate, and the corresponding traffic count stations that produce annual traffic counts to analyze increases or decreases in VMT.