Guidelines for Quantifying Benefits of Traffic Incident Management Strategies (2022) / Chapter Skim
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Pages 43-49
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43 Table A1 summarizes common rules of thumb related to TIM. Tables A2 to A5 summarize rules 1 to 4 from Table A1 to clarify the research conducted to validate the rule, strengths, limitations, and overall assessment of usability.
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44 Guidelines for Quantifying Benefits of Traffic Incident Management Strategies Common Rule of Thumb Application Source 1. Every minute a freeway lane is blocked due to a traffic incident results in 4 minutes of added travel delay.
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Common TIM Rules of Thumb 45 Research and Validation Discussion • A good discussion of this topic is contained in a memorandum prepared by Oregon DOT. 1 • VISSIM simulation study explored this issue at different levels of demand and incident severity (Saka et al., 2008)
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46 Guidelines for Quantifying Benefits of Traffic Incident Management Strategies Research and Validation Discussion • Rules of thumb values based on Goolsby3 (Texas A&M Transportation Institute [TTI]
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Common TIM Rules of Thumb 47 Research and Validation Discussion • Rule of thumb value established from source, Traffic Congestion and Reliability: Linking Solutions to Problems (FHWA)
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48 Guidelines for Quantifying Benefits of Traffic Incident Management Strategies Research and Validation Discussion • Rule of thumb from FHWA. 5 • Recent studies, using advanced research methodologies, have found that secondary crashes occur with frequency lower than 20%.
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Common TIM Rules of Thumb 49 Limitations • Based on recent findings, including this study, 20% appears to be high. • The relative proportion of secondary crashes compared to all incidents does not reveal the benefits of TIM; however, if one has good before and after data on the total number of incidents, one can estimate the number of secondary crashes reduced by the TIM activities being evaluated.
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