Incorporation of Travel Time Reliability into the HCM

Abstract

This prepublication, non-edited report serves as a supplement to the Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual (HCM) prepared for this same Transportation Research Board's second Strategic Highway Research Program (SHRP 2) project. The proposed chapters are designed to demonstrate how to apply travel time reliability methods to the analysis of freeways, urban streets, and corridors. The current report presents a summary of the work activities conducted during the course of developing the proposed chapters. The final report is designed to preserve the logic and rationale used to develop the proposed chapters as an aid to those who may build upon the work completed in this effort. The two proposed HCM chapters, numbers 36 and 37, introduce the concept of travel time reliability and offer new analytic methods. The prospective Chapter 36 for the HCM concerns freeway facilities and urban streets and the prospective supplemental Chapter 37 elaborates on the methodologies and provides an example calculation. The chapters are proposed; they have not yet been accepted by the Highway Capacity and Quality of Service Committee of the Transportation Research Board.

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