Studies & Reports
To date there have been numerous studies determining the effectiveness of in-roadway warning lights (IRWLs) in a variety of settings and roadway safety applications.
Whether the study is comparing the effectiveness of overhead signals to IRWL; identifying ideal IRWL placement; or the effectiveness of uni-directional IRWL systems—every IRWL study conducted leads to the same conclusion: the incidence of conflict between pedestrians and motorist is decreased, and motorist yielding to pedestrians and stop time is significantly increased.
Below are industry studies using LightGuard Systems’ flashing in-roadway warning lights to illuminate pedestrian crosswalks, rail grade crossing vehicle stop lines, and to flash in sync with stop light signals at a controlled intersection.
Whitlock & Weinburger Report - The original study conducted on IRWL enhanced crosswalks systems that led to the adoption of IRWL systems as a national standard -
The Kirkland Study And Report - Kirkland's Experience with In-Pavement Flashing Lights At Crosswalks, February 1999
Evaluation of In-Pavement Flashing Lights on a Six-Lane Arterial Pedestrian Crossing - 2000
Crosswalk Enhancement Comparison Study, City of San Jose - 2001
National Cooperative Highway Research Program (NCHRP) Report - Applications of Illuminated, Active In-Pavement Marker Systems - 2008
Studies of Traffic Signal Enhancement (TSE™) Red Light Running Solutions
Report on TraxAlert™ Installation, Paramount, CA - IRWL Systems at Highway & Railroad Grade Crossings
Effects of In-Pavement Lights on Driver Compliance with Grade Crossing Safety Equipment, Federal Railroad Administration, May 2019