Development of Guidelines for Quantifying Benefits of Traffic Incident Management Strategies (2022) / Chapter Skim
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1 SUMMARY Ensuring a coordinated response to highway crashes and other incidents is vital to protecting public safety, keeping traffic moving and reducing environmental impacts. Traffic Incident Management (TIM)
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2 The review identified 15 benefits estimation frameworks. This is by no means an exhaustive list of frameworks but a reflection of the various approaches.
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3 Table 1: Summary of Available Capacity Ratio Estimates from Incidents in Maryland, Virginia, and Texas Number of Lanes by Direction Shoulder Disablement Shoulder Accident One Lane Blocked Two Lanes Blocked Three Lanes Blocked 3 0.79a 0.77c 0.55b 0.24a 4 0.91a 0.87 0.69 b 0.30a 0.18a 5 0.76 b 0.60a 0.32 a, b, c Difference compared to HCM estimate is statistically significant at 99%, 95%, and 90% confidence interval, respectively. HCM Available Capacity Ratio Estimates 3 0.99 0.83 0.49 0.17 4 0.99 0.85 0.58 0.25 0.13 5 0.65 0.40 0.20 The findings of this effort should be corroborated with a larger dataset prior to making formal practice recommendations.
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4 difference between these two conditions is the net benefit resulting from TIM efforts. Note that if the analysis period and analysis corridor selected in the pre-processing task did not include the entire TIM network and final analysis period (typically TIM evaluations are done on an annual basis)
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