Based on the outputs from the 2009 Focus State Initiative (FSI) final report, (to learn more about the FSI process click here) FHWA encourages the use of the three national TIM performance measures, namely:
- Roadway clearance time.
- Incident clearance time.
- Secondary crashes.
A 2011 FHWA report, “Traffic Incident Management Performance Metric Adoption Campaign,” documented efforts to encourage adoption of these three national TIM performance measures, including an inventory of existing TIM performance measurement practices. The objectives of the project were to (1) identify the TIM-specific measures collected in 40 metropolitan areas, determine the existing definitions of “secondary crash” and assess consistency of definitions with the FHWA definitions, and (2) establish a national baseline for the use of the three national TIM performance measures. During this study, significant insights were gained regarding the existing practices of agencies with respect to implementing and using these measures (9). Some of these practices are presented and summarized in the context of the three national TIM performance measures.
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