Unsignalized Intersection Improvement Guide

Practical guidance for improving the safety, mobility, and accessibility at unsignalized intersections

From 2010-2012, there were 21,000 fatal crashes throughout the United States. 15,000 of those crashes (more than 70%) occurred at intersections that are not under the control of a traffic signal.

With a goal of improving the safety, mobility, and accessibility at unsignalized intersections, the new Unsignalized Intersection Improvement Guide (UIIG) was developed as a web-based tool to assist local agency practitioners in selecting design, operations, maintenance, enforcement, and other types of treatments to improve safety, mobility, and accessibility at unsignalized intersections. The tool was produced by the National Cooperative Highway Research Program (NCHRP) and is now hosted by the Institute of Transportation Engineers (ITE) under the sponsorship of the Federal Highway Administration (FHWA) Office of Safety. Ray Derr of TRB, who served as the project manager for NCHRP, deserves special recognition for the exceptional job he did in pulling this tool together.

Steve Brown of Fehr & Peers Los Angeles also served on the expert oversight panel as the only private sector panelist. According to Steve, “Participating on this panel was a valuable experience as you are given the opportunity to influence important policy activities and gain exposure to perspectives from around the country.”

The structure of this web-based tool includes a characterization of the “problem” where the user is able to determine what the root of the issue is and then understand better treatments to directly address that problem. The incorporated menu includes problems categorized based on what is measurable in the field. Also included is a section titled, “What would MUTCD say?” to make this a one-stop-shop for improving safety concerns. Multimodal tradeoffs are also considered in the “Treatment Alternatives Filter.”

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