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SDI Waze Project Summary Documents

Year: 2019

The City of Bellevue in Washington State is committed to implementing a Vision Zero plan, with the goal of zero traffic deaths and serious injuries by 2030. The transportation planning department partnered with the SDI to evaluate how integrating Waze with traffic safety data can inform Vison Zero strategies.

Year: 2019

 The Tennessee Integrated Traffic Analysis Network (TITAN) crash model is used by the Tennessee Highway Patrol (TN HP) to prioritize patrol locations. The model combines historical data such as fatal crashes and DUI arrests with current data including weather forecasts, and scheduled special events to generate heat maps that identifies areas of high likelihood for crashes.


The TITAN model estimates crash propensity in 42 square mile grids. This resolution provides the most accurate estimates of fatal crash propensity in four hour time windows over the upcoming week, based on scheduled special events and weather forecasts. The objective of the TN HP and U.S. DOT SDI partnership was to test if Waze alerts can improve the spatial resolution of the TITAN model, particularly in urban areas. TN HP provided training data from the TITAN model, and the Volpe team quantitatively assessed the value that Waze data adds to the existing TITAN model.

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Last updated: Friday, November 1, 2019