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Estimating FAST Act Reliability Measures with the HCM 6

The Highway Capacity Manual (HCM) 6th Edition incorporates the results of millions of dollars of national, peer-reviewed research that has occurred since the publication of the HCM 2010. This edition of the HCM introduces a number of new capabilities, including travel time reliability forecasting, alternative intersections analysis, managed lane analysis, and work zone analysis. It also updates a number of existing methodologies, including those for freeway facilities and roundabouts. Recognizing that most users of the HCM implement its methods through software, this edition of the HCM highlights information that users need to know when applying the manual through software, such as input data needs and potential sources for specific performance measures, recommended default values, information on the sensitivity of results to specific inputs, and guidance on interpreting analysis results. Finally, the HCM’s expanded name, Highway Capacity Manual, 6th Edition: A Guide for Multimodal Mobility Analysis is intended to highlight the HCM’s ability to analyze the operation of non-auto modes, and to highlight the range of roadway performance measures the HCM provides beyond traditional level of service.

The fourth webinar in the series will describe the capabilities of the HCM6 to perform reliability analyses of freeways and urban streets. With new federal performance measures through the MAP-21 and FAST Act rulemaking, transportation professionals need to understand reliability performance measures and how to predict them. The HCM6 is uniquely suited to estimate the reliability distribution, and can derive various reliability performance measures, including the MAP-21/FAST Act measures. The webinar will describe the method used to estimate reliability, under considerations of sources of non-recurring congestion that include demand variability and effects from weather, incidents, and work zones. The webinar will present case studies to illustrate the reliability method, as well as ways in which ATDM strategies can be evaluated to improve reliability.

Learning Objectives

  • Understand the unique capabilities of the HCM methods in predicting reliability
  • Learn, at a high level, about the steps in the HCM reliability method
  • Learn about the ability of the HCM to predict the impacts of various non-recurring sources of congestion on performance
  • Understand the ability of HCM methods to include Active Traffic and Demand Management (ATDM) strategies to improve reliability
Instructors' Names, Bios and PDF Presentations can be found by clicking the recording link below. Once you click the recording below, click the "resources" tab to locate the PDF (after purchasing).