NCHRP 3-60A Validation and Enhancement of the Highway Capacity Manual's Interchange Ramp Terminal Methodology
Contracting Agency: National Cooperative Highway Research Program Subcontractors: University of Hartford (Clara Fang, Ph.D.), Roger Roess, Ph.D. Principal Investigator: Lily Elefteriadou, Ph.D.
Interchange ramp terminals are critical components of the highway network. They provide the connection between various highway facilities (i.e., freeway - arterial, arterial - arterial, etc.) and thus their safe and efficient operation is essential. Interchanges have to be designed to work in harmony with the freeway, the ramps and the arterials. In addition, they need to provide adequate capacity to avoid impacting the connecting facilities. NCHRP Project 3-60 Capacity and Quality of Service of Interchange Ramp Terminals developed improved methods for capacity and quality of service analysis of interchange ramp terminals, and produced a draft Chapter 26 of the 2000 Highway Capacity Manual (HCM). The scope of that project however did not include data collection, and thus the methods provided in this draft chapter were developed primarily based on the results of microscopic simulation.
The objective of this project was to enhance the analysis methods developed under NCHRP 3-60 by validating the methodology using field data, extending it to consider the impacts of adjacent signalized intersections, and adding methods for analyzing interchanges with roundabouts. The revised chapter developed is part of the 2010 edition of the HCM (developed under the NCHRP 3-92 project.)
Transportation Research Center Lily Elefteriadou, Ph.D., TRC Director
University of Florida Civil & Coastal Engineering
512 Weil Hall | PO Box 116500 | Gainesville, FL 32611-6580
352.392.9537, Ext. 1409