Effectiveness of the all-red clearance interval on intersection crashes

dc.contributor.author O'Brien, Molly
dc.contributor.department Department of Civil, Construction and Environmental Engineering
dc.date 2020-07-17T07:21:39.000
dc.date.accessioned 2021-02-26T08:32:20Z
dc.date.available 2021-02-26T08:32:20Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2003
dc.date.issued 2003-01-01
dc.description.abstract <p>[Crashes at signalized intersections account for approximately 20% of all crashes both nationally and within the State of Minnesota. Several research efforts have suggested that the use of all-red clearance interval at signalized intersections may reduce intersection crashes, particularly those related to signal violations. However, other research has shown that an all-red interval does not result in a reduction in crash rate. This research also evaluated the reduction in crashes due to use of an all-red interval at intersections within the City of Minneapolis. A cross-section analysis using generalized linear mixed models with a Poisson error distribution and log link function and mixed linear models with transformed data were used to compare Minneapolis sites with and without the all-red clearance interval. Results of the analysis agree with the previous studies that indicate no effect. A before and after analysis was also conducted to evaluate both short-term reduction in crash rate lasting approximately one year after implementation of an all-red interval. The research also evaluated user costs in the form of increased delay due to reduction in capacity that would result from implementation of the all-red interval at the remaining Minneapolis intersections that currently do not use the interval. Although a short-term effect was noted, the temporary safety benefits may not outweigh the long-term reductions in capacity and should be considered before implementation. Additionally, although no statistically significant long-term benefit was demonstrated, research results do not provide guidance on elimination of the all-red clearance intervals at intersections where it is currently in use.]</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/19528/
dc.identifier.articleid 20527
dc.identifier.contextkey 18549555
dc.identifier.doi https://doi.org/10.31274/rtd-20200716-95
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/19528
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/96895
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/19528/O_Brien_ISU_2003_027.pdf|||Fri Jan 14 21:57:31 UTC 2022
dc.subject.keywords Civil and construction engineering
dc.subject.keywords Civil engineering (Transportation engineering)
dc.subject.keywords Transportation engineering
dc.title Effectiveness of the all-red clearance interval on intersection crashes
dc.type thesis en_US
dc.type.genre thesis en_US
dspace.entity.type Publication
relation.isOrgUnitOfPublication 933e9c94-323c-4da9-9e8e-861692825f91
thesis.degree.discipline Civil Engineering (Transportation Engineering)
thesis.degree.level thesis
thesis.degree.name Master of Science
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