Daily Vehicle Hours of Delay Due To Congestion

Santa Clara & San Mateo Counties, San Francisco, and the Bay Area

Data Source:

Caltrans PeMS


Silicon Valley Institute for Regional Studies

Data are from Caltrans PeMS (Performance Monitoring System) that collect and archives traffic data from the Caltrans network of roadway traffic sensors. The reported traffic delay data are based on the detector coverage and health at the time that the data was collected by PeMS. Accordingly, actual traffic delays experienced in each county may be higher than those reported. Data includes California State Freeways only (not all state highways). Silicon Valley data include Santa Clara & San Mateo Counties. One vehicle hour of delay reflects one vehicle stuck in traffic for one hour. Delay refers to speeds less than 60 miles per hour.

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Resources for Relevant Data and Reports (show)

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