Center for Transportation Research and Education

About the research

This study examined the operation of static and dynamic no right turn on red (NRTOR) signs at eight signalized intersections in Minnesota (six dynamic and two static). Driver compliance with the NRTOR indications were measured using video data. Most dynamic NRTOR sign locations were pedestrian-activated, with one location having additional time-of-day activation of the NRTOR indication. Compliance rates were calculated per signal cycle and per vehicle. Per-cycle compliance rates were 60.8% for dynamic and 80.0% for static sign locations, while per-vehicle compliance rates were 87.1% for dynamic and 92.4% for static sign locations. Statistical models were further developed to confirm the statistical significance of the results and to explore the strength of the effect compared to other intersection characteristics. A survey of practitioners was included to identify the installation and maintenance costs of DNRTOR devices. The report concludes with recommendations on uses of DNRTOR.