United States Department of Transportation
i
MD 210 Before and After Case Study for Speed Management Practices
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2024-11-01
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[PDF-2.28 MB]
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Edition:MDOT SHA Final Report (Apr 2023-Nov 2024)
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Abstract:MD 210 is known as one of the most dangerous roads in the state of Maryland. While MDOT SHA is aware that speeding is contributing factor in most crashes on MD 210, conventional efforts to reduce speeding, such as signing and automated speed enforcement have not been successful. In addition to speeding, driving behaviors such as harsh braking, harsh accelerations, and distracted driving can further increase the risk of crashes, especially when paired with excessive speeding. To more fully capture and address safety issues on MD 210, it is important to understand a broader range of unsafe driving behaviors beyond speeding alone. To address this urgent need, the CATT Lab employed a multi-faceted approach to the MD 210 safety issue, using both traditional and non-traditional traffic safety data to explore factors contributing to MD 210 safety issues and to evaluate the effectiveness of planned engineering solutions. Non-traditional traffic safety data included telematics-style data from Michelin that summarized harsh driving events on roadway segments. The study developed a rigorous analysis framework that included the use of Gower distance for control site selection, and the application of Interrupted Time Series and Difference-in-Differences models to evaluate the change in key safety performance measures. The study found that the installed countermeasures did not significantly impact the safety performance of MD 210.
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