United States Department of Transportation
i
Modifying Ramp Management Strategies to Enhance Resiliency of Freeway Facilities
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2023-09-01
[PDF-1.48 MB]
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Edition:Final Research Report
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Abstract:Chapter 26 of the HCM6 suggests a procedure for the empirical estimation of freeway capacity, which is based on the direct estimation of breakdown probabilities for bins of traffic volumes. The paper expounds that this methodology is unsuitable to obtain reliable capacity estimations. The theoretical analysis of the deficiencies of the methodology is supported by empirical capacity estimations for twelve freeway sections in California. Based on the empirical results, alternatives for the HCM6 capacity estimation methodology based on statistical models for censored data as well as the distribution of pre-breakdown volumes are proposed and validated. Once the models for censored data is implemented to estimate a reliable capacity distribution function for the freeways, it is used to modify an existing ramp metering algorithm.
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