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Unsignalized Intersection Improvement Guide - Practical guidance for improving the safety, mobility, and accessibility at unsignalized intersections.

Authors and Acknowledgements

The Unsignalized Intersection Improvement Guide (UIIG) was developed under a contract with the National Cooperative Highway Research Program (NCHRP) of the National Academy of Sciences, Project 03-104; Mr. Ray Derr was the project engineer. 

The Guide was prepared by VHB, with Dr. Hugh W. McGee as the principal investigator.  VHB staff who developed the technical content included Jonathan Soika, Rebecca Fiedler, Matthew Albee, Anne Holzem, and Kim Eccles.  VHB staff who developed the website and Toolkit materials included Eric Vierra, Gaetan Siry, Jason Nicholson, and Jorge Quinones. VHB was supported by Michael Cynecki and Yung Koprowski of Lee Engineering, LLC and consultants Anthony Giancola, Frank Spielberg, and Capt. Glenn Hansen.

Early in the project, VHB received valuable input from a Technical Advisory Group composed of the following practitioners:

  • Kurt Blomquist, Public Works Director, City of Keene, NH
  • Steven Casstevens,  Chief of Police, Cary (IL) Police Department
  • Bruce Drewes, Idaho Local Technical Assistance Program Manager
  • Ron Eck, Consultant, Morgantown, WV
  • Susan Hann, City Manager, City of Palm Bay, FL
  • Stephen Landry, Assistant State Traffic Engineer, Maine Department of Transportation
  • Keary Lord, Assistant Director, Traffic Division, Douglas County, GA
  • Girish Modi, Chief Safety Management Division, Pennsylvania Department of Transportation
  • Wayne Sandberg, Deputy Public Works Director, Washington County, MN
  • Dona Sauerburger, Orientation & Mobility Specialist

Also, the following NCHRP project panel members provided substantial guidance and critique throughout the project:

  • Vickie Embry, City of High Point, NC (Panel Chair)
  • Terry Berends, Washington State Department of Transportation
  • Steven Brown, Fehr & Peers, Inc.
  • B. Kent Lall, Portland State University
  • John Miller, Missouri Department of Transportation
  • Thomas Mulinazzi, University of Kansas
  • Narasimha Murthy, Murthy Transportation Consultants, Inc.
  • Dennis Randolph, City of Grandview, MO
  • Christopher Speese, Pennsylvania Department of Transportation
  • David Engstrom, Federal Highway Administration
  • Scott Windley,  U.S. Access Board

Finally, the work of Charlie Zegeer and his staff at the University of North Carolina Highway Safety Research Center is acknowledged.  They developed online tools for practitioners to identify potential engineering, enforcement, and education treatments to improve pedestrian and bicycle safety and/or mobility based on user input.  Their Pedestrian Safety Guide and Countermeasure Selection System (PEDSAFE) and the Bicycle Countermeasure Selection System (BIKESAFE) served as models for the UIIG.