Project Summary

To make their streets safer for biking and walking, Seattle needed to take stock of its current street network. The Seattle Department of Transportation (SDOT) asked Toole Design for help, and we conducted a multivariate analysis of crash, roadway, land use and other data to give SDOT a more accurate assessment of the current risks to bicyclists and pedestrians across the city. The city knew that reacting to crashes would not be the best way to eliminate serious injuries and fatalities: they needed a way to predict locations where crashes might occur. The BPSA analysis was the first citywide metric used in the United States to proactively identify places with greater risk for people walking and biking, and BPSA metrics form a major component of SDOT’s approach to identifying and scoping roadway and signal improvement projects. We are updating the metric with new data and improving the tool for Seattle to use to improve safety for years to come.

 

 

The city knew that reacting to crashes would not be the best way to meet their Vision Zero goal to eliminate serious injuries and fatalities: they needed a way to predict locations where crashes might occur.

The BPSA helps SDOT understand potential risk to people walking and biking throughout the street network, which informs both systemic safety improvements and the project development process for capital projects.

In order to better understand risk, we developed a citywide exposure model using an aggregation of statistically significant variables, including Strava data, and mapped it across all nine city council districts to better inform stakeholders and decision-makers.

From our analysis, we created a predictive model for bicycle and pedestrian crashes, allowing SDOT to plan streetscape improvements that would make their streets safer before crashes happen.
We paired the data analysis with site visits to discuss appropriate countermeasures for locations identified by the model, giving SDOT the necessary tools to take action.

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