Minnesota Department of Transportation Research Services Section
A majority of intersection-related fatal crashes occur at rural, through/stop intersections. At these intersections,
sight restrictions caused by vertical and horizontal curves negatively affect a driver’s ability to safely accept a gap
in the traffic stream. Static advanced warning signs are sometimes installed at these intersections to warn drivers on
the main, through approaches that an intersection is ahead. These warning signs appear to be ineffective. A new
Advanced Light-Emitting Diode (LED) Warning System was developed and deployed at a rural, through/stop
intersection with limited intersection sight distance due to a severe vertical curve. This warning system actively
detects vehicles on all approaches and activates LED blinker warning signs for the conflicting movements. The
research project included analysis of driver behavior obtained through video data and a survey of local residents
and frequent users of the intersection. This report describes the development, implementation, and evaluation
results of this new warning system.
Minnesota Department of Transportation
Research Services Section
Kwon, Taek Mu; Weidemann, Ryan.
Advanced LED Warning Signs for Rural Intersections Powered by Renewable Energy.
Minnesota Department of Transportation Research Services Section.
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