State and Local Government Data Analysis Tools to Support Policy and Decision Making for Roadway Safety – MassDOT IMPACT Safety Analysis Module
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2021-08-29
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Edition:Final Report (September 2020 to August2021)
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Abstract:The Massachusetts Department of Transportation (MassDOT) identified the need to build safety analysis tools into the recently-developed Interactive Mapping Portal for Analysis and Crash Tracking (IMPACT) Crash Data Portal. MassDOT worked with highway safety stakeholders to summarize their needs then developed four tools to be added: Crash-Based Network Screening Maps, Risk-Based Network Screening Maps, a Crash Tree Maker, and a Test of Proportions Tool. MassDOT contracted with VHBto perform the supporting safety analysis and develop the proposed IMPACT tools with funding from the United States Department of Transportation (USDOT) Safety Data Initiative. MassDOT used Empirical Bayes methods to develop crash-based network screening maps and systemic safety analysis techniques to develop risk-based network screening maps. MassDOT developed the tools using an Agile project management approach using the Angular library. MassDOT learned and summarized numerous lessons from this project. Additionally, MassDOT is planning improvements to these tools in a future development phase of IMPACT. The tools described herein can be accessed at https://apps.impact.dot.state.ma.us/cdp/home.
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