Evaluation of blue confirmation lights at signalized intersections in Overland Park, Kansas, to reduce red light running violations.
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2015-10-01
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Abstract:Red Light Running (RLR) is a safety concern for communities nationwide. The Federal Highway
Administration (FHWA) reported that a total of 676 fatalities in 2009 were due to RLR. There are many
strategies to mitigate RLR violations that fall in the categories of engineering, enforcement, or education.
This research project focused on confirmation lights, a low-cost countermeasure which enhances
enforcement at four-approach intersections. Confirmation lights were deployed at two intersections in
Overland Park, Kansas. Traffic was observed at the treatment sites, nearby signalized intersections
(spillover), and control sites. Traffic was recorded before deployment, 1 month after, and 3 months after
deployment. A total of 14 intersections were recorded during the morning peak hours (7 a.m. to 9 a.m.) and
the afternoon peak hours (4 p.m. to 6 p.m.) for a total of 583 hours of traffic video. A test of proportions
showed that overall the confirmation lights did not significantly reduce RLR violations. A violation analysis
showed that there was a global increase in RLR violations after deployment, indicating that other factors
were involved in the increase of violations observed. Time into the red analysis showed that the majority of
RLR violations occurred within 1 second into the red. The negative binomial regression model re-affirmed
that the confirmation lights were not a significant factor in the RLR violations observed. The model showed
that lane volume, presence of a right-turn lane, and traffic movement (left or through movement) were
significant factors.
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