Civil Engineering Association

Determining Guidelines for Ramp and Interchange Spacing

Author: Ray, Brian L Kittelson and Associates, Incorporated Schoen, James Kittelson and Associates, Incorporated Jenior, Pete Kittelson and Associates, Incorporated Knudsen, Julia Kittelson and Associates, Incorporated Porter, Richard J University of Utah, Salt Lake City Leisch, Joel P Mason, John Roess, Roger | Size: 5.70 MB | Format: PDF | Quality: Original preprint | Publisher: Transportation Research Board | Year: 2010 | pages: 238 | ISBN: -

This project considered the effects of geometry, traffic operations, safety, signing, and other factors to develop guidelines for understanding the considerations that influence minimum ramp and interchange spacing values. Phase I included conducting a literature search and other information gathering activities, developing a work plan to assess the impact of ramp spacing on traffic operations and safety, and developing a framework for the research guidelines. Phase II included creating microscopic simulation models of closely-spaced ramp combinations calibrated with field data, constructing a crash database and developing crash prediction models, developing a set of guidelines for ramp and interchange spacing, and recommending changes to major resource documents within the transportation profession. As a final product, the team wrote NCHRP Report 687, "Guidelines for Ramp and Interchange Spacing," to assist users as they consider new or modified ramps and interchanges.

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