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NCHRP 3-88 Final Report Guidelines for Ramp and Interchange Spacing i Acknowledgments The research reported herein was performed under NCHRP Project 3-88 by Kittelson & Associates, Inc.; University of Utah; Texas Transportation Institute; Traffic Research and Analysis, Inc.; and the following independent consultants: Joel Leisch, P.E.; John Mason, PhD, P.E; and Roger Roess, PhD. Kittelson & Associates, Inc. was the contractor for this study. The work undertaken by other project team members occurred under subcontracts with Kittelson & Associates, Inc. Brian Ray, P.E., Principle Engineer, Kittelson & Associates, Inc. was the principal investigator. Jim Schoen, P.E., Senior Principle Engineer, Kittelson & Associates, Inc., was project principal. The other authors of this report are Pete Jenior, Transportation Analyst, Kittelson & Associates, Inc.; Julia Knudsen, P.E., Engineering Associate, Kittelson & Associates, Inc.; Elizabeth Wemple, P.E., Kittelson & Associates, Inc.; Shaun Quayle, P.E., Engineering Associate, Kittelson & Associates, Inc.; Alex Kihiri, Transportation Analyst, Kittelson & Associates, Inc.; R.J. Porter, PhD, Assistant Professor, University of Utah; Thanh Le, Graduate Research Assistant, University of Utah; and Yongqing Guo, Graduate Research Assistant, University of Utah. During the project, R.J. Porter moved from the Texas Transportation Institute to the University of Utah. The project team acknowledges the contributions of the individuals who participated in a focus group at the early stages of the project: John Steele, California Department of Transportation; Bill Prosser, Federal Highway Administration; Mark Johnson, Oregon Department of Transportation; Kent Belleque, Oregon Department of Transportation; Jim Heacock, Texas Department of Transportation; Richard Coakley, CH2M Hill (Milwaukee, Wisconsin); and Gary Sokolow, Florida Department of Transportation. In addition, the project team appreciates and acknowledges the contributions of the Arizona Department of Transportation, especially Mark Catchpole, in providing historical volume and speed data for the Phoenix-area sites where data was collected as part of this project. The project team also greatly appreciates the efforts of Yusuf Mohamedshah, Lab Manager of the Highway Safety Information System, Lendis Corporation and Kevin Perkins, Washington Department of Transportation, in gathering required data elements for the safety analysis. Our research team also provides special thanks to Joel Leisch, who provided special access to the historical documents of industry leader Jack E. Leisch. Joelâs passion for integrating planning, design, and operations in freeway and interchange evaluations helped provide cohesive and sound research products. Finally, the research team also acknowledges the guidance, support, and inspiration provided by the NCHRP Project 3-88 Panel Chair and Panel Members throughout the course of the project and research efforts. These
Final Report NCHRP 3-88 Guidelines for Ramp and Interchange Spacing ii panel members customized and adapted their participation in the research to provide an improved product.
