Over 35,000 people die on US roads every year, a traffic safety crisis unmatched in severity by the US’s industrialized peers. The guidance ranges from step-by-step checklists for conducting activity level & conflict density analyses, to nuanced metrics for documenting speeds that go beyond percentile-based speed setting practices. The methods outlined in City Limits can be combined, and, unlike percentile-based approaches, each is context-sensitive, allowing cities to holistically evaluate who is using streets and how people are using them, from people walking and biking, to those taking transit or visiting a school. Setting corridor speed limits on high priority major streets, using a safe speed study, which uses conflict density and activity level to set context-appropriate speed limits.Designating slow zones in sensitive areas, and.Setting default speed limits on many streets at once (such as 25 mph on all major streets and 20 mph on all minor streets),.the 85th percentile) that often result in speeds that are inappropriately fast for urban environments.Ĭity Limits outlines a three-method approach to speed limit setting that provides an alternative to percentile-based speed limit setting: Developed by a steering committee of NACTO’s 86 member cities and transit agencies, City Limits outlines how to use a safe systems approach to set speed limits in urban environments, in contrast to legacy methods (e.g. The National Association of City Transportation Officials (NACTO), today released an innovative, tested, and proven framework for setting safe speed limits for city streets. Speeds and crash severity have increased on many streets during the coronavirus pandemic, underlining the importance of safer speed limits roadways every year, at a rate twice as high as peer countriesĬurrent speed limit setting practice results in unsafe streets new NACTO guidelines outline how to use a tested and proven safe systems approach to set safer speed limits in urban areas
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