Development of Guidelines for Quantifying Benefits of Traffic Incident Management Strategies (2022) / Chapter Skim
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Pages 137-140
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137 COMMON TIM RULES OF THUMB ASSESSMENT This section provides information on several TIM rules of thumb. It is acknowledged that rules of thumb provide fast and easy analysis at a high level.
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138 7.2. Reduction in Traffic Flow Due to Incidents TIM Rules of Thumb: One blocked lane out of three will reduce traffic flow by about 50 percent; Two blocked lanes out of three will reduce traffic flow by about 80 percent.
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139 7.3. Contribution of Traffic Incidents to Total Congestion from All Sources TIM Rule of Thumb: Highway incidents cause about 25 percent of the total congestion (delay)
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140 7.4. Secondary Crashes as a Percentage of All Crashes TIM Rule of Thumb: Approximately 20 percent of all incidents are secondary incidents.
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