Collision Analysis. Collision data from the Caltrans District 4 Traffic Accident Surveillance and Analysis System (TASAS) was compiled for the I-680 corridor from PM R8.120 in Alameda County to PM R2.870 in Contra Costa County. Collision information is provided for the most recent three years of complete data: January 2017 through December 2019. Table 4-3 summarizes the TASAS collision data as it relates to the statewide averages for similar facilities. Collision rates are expressed as accidents per million vehicle miles traveled.
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Sources: Project Baseline Agreement, Project Baseline Agreement