United States Department of Transportation
i
Empirical observations of red light running at arterial signalized intersection.
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2008-12-01
[PDF-755.54 KB]
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Abstract:Red Light Running (RLR) has become an increasely national safety issue at signalized intersections.
Significant efforts have been made to understand the RLR related driver behaviors and develop
countermeasures to reduce RLR and its related crashes. At high speed intersections, it has been well
shown that drivers caught in dilemma zone is an important reason of RLR. While at arterial intersections,
there are still needs to further investigate RLR related driver behaviors. We carried out our research at
a well-designed arterial intersection (speed limit 35 mph to 30 mph, approach dependent) and collected
data using multiple discrete point sensors at different distances-to-intersection from multiple approaches.
Empirical data showed that for over 90% of the RLRs, the drivers were not trapped in dilemma zone at
yellow onset. Instead, they could have stopped safely and comfortably. Further analysis of the empirical
data showed that over 60% of the RLR were with a headway less than 3 seconds, or belonged to a platoon.
The average headway of RLR vehicles were 10% less than that of vehicles going through yellow. The
findings were used in the development of an all-red interval extension system for intersection collision
avoidance.
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