Update of Highway Capacity Manual: Merge, Diverge, and Weaving Methodologies (2023) / Chapter Skim
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Introduction This document is the final report of NCHRP Project 07-26, "Update of Highway Capacity Manual: Merge, Diverge, and Weaving Methodologies." The project focused on updating the methodologies in the Highway Capacity Manual (HCM) Chapter 13: "Freeway Weaving Segments" and Chapter 14: "Freeway Merge and Diverge Segments" for forecasting the operation of merges, diverges, and weaves along general-purpose freeway lanes.
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2 Update of Highway Capacity Manual : Merge, Diverge, and Weaving Methodologies (10 sites) , ground- or pole-based video (two sites)
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Summary 3 last decade. Using sensor-based data sources, this project was able to gather data efficiently from over 120 freeway bottlenecks, generally covering a full year of observation.
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4 Update of Highway Capacity Manual : Merge, Diverge, and Weaving Methodologies – The average speed and the capacity of a merge segment decrease as the percentage of segment volume consisting of merging traffic increases. Accordingly, the capacity of a merge segment may change by the time of day as the volume of merging traffic fluctuates.
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Summary 5 • Weaving – The recommended speed model has a much lower RMSE for both simple weaves (the most common type of weave) and complex weaves (3.22 and 4.86 mph, respectively)
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