Vehicle Miles Traveled per Capita and Gas Prices

Santa Clara & San Mateo Counties

Vehicle Miles Traveled (VMT) estimates the number of vehicle miles that motorists traveled on California roadways. Various roadway types are used to calculate VMT. Silicon Valley data include travel within Santa Clara and San Mateo Counties. Unlike earlier years, the 2014 and 2015 Highway Performance Monitoring System (HPMS) data does not include functional class 7 (local roads) or data from federal agencies. This change was due to the migration of the HPMS to a new Linear Referencing System (GIS layer). The California Department of Finance’s E-4 Population Estimates were used to compute per-capita values. Average annual gas prices are from the U.S. Energy Information Administration, and have been inflation-adjusted and are reported in 2015 dollars, using the California consumer price index for all urban consumers from the California Department of Finance May Revision Forecast (April 2016).

Gas prices are average annual regular retail gas prices for California, inflation-adjusted to 2015 dollars. The decline in VMT per Capita between 2013 and 2014 may be due to differences in data collection methodology between 2014 and prior years.

Resources for Relevant Data and Reports (show)

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