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Safety and Operational Assessment of Gap Acceptance Through Large-Scale Field Evaluation

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dc.contributor.advisorMichael A. Knodler
dc.contributor.authorTupper, Steven Maxwell
dc.contributor.departmentUniversity of Massachusetts Amherst
dc.contributor.departmentCivil Engineering
dc.date2023-09-23T03:38:48.000
dc.date.accessioned2024-04-26T21:13:20Z
dc.date.available2011-04-15T00:00:00Z
dc.date.issued2011-01-01
dc.date.submittedMay
dc.description.abstractGiven that “driver error” is cited as a contributing factor in 93 percent of all crashes, understanding driver behavior is an essential element in mitigating the crash problem. Among the more dangerous roadway elements are unsignalized intersections where drivers’ gap acceptance behavior is strongly correlated to the operational and safety performance of the intersection. While a basic understanding of drivers’ gap acceptance behavior exists, several unanswered questions remain. Previous work has attempted to address some of these questions, however to date the research has been somewhat limited in scope and scale due to the challenges of collecting high fidelity gap acceptance data in the field. This research initiative utilized software newly developed for this project to collect gap acceptance data on 2,767 drivers at 60 sites, totaling 10,419 driver decisions and 22,639 gaps in traffic. This large-scale data collection effort allowed many of these remaining questions to be answered with an improved degree of certainty. This research initiative showed that naturalistic driver gap acceptance behavior can realistically be observed and accurately recorded in the field in real time using a newly developed software tool. This software tool and study methodology was validation using high fidelity video reduction techniques. This research compared different methods of analyzing gap acceptance data, in particular determining critical gap, seeing that the method used significantly affects the results. Conclusions were draw about the merits of each of the ten analysis methods considered. Through the analysis of the large data set collected, the research determined that there exist appreciable and identifiable differences in gap acceptance behavior across drivers under varied conditions. The greatest differences were seen in relationship to wait time and queue presence. If a driver has queued vehicles waiting behind them and/or has been waiting to turn for a long period of time, they will be more likely to accept a smaller gap in traffic. Additionally, an analysis of gap acceptance as it relates to crash experience identified critical situations where a driver's gap acceptance behavior contributes to the occurrence of a crash. Characteristics of the driver such as gender and approximate age associated with specific crashes were examined. Teen drivers were identified as exhibiting aggressive gap acceptance behavior and were found to be overrepresented in gap acceptance related crashes. Ultimately, a better understanding of the driver and environmental factors that significantly contribute to increased crash risk will help guide the way to targeted design solutions.
dc.description.degreeMaster of Science in Civil Engineering (M.S.C.E.)
dc.identifier.doihttps://doi.org/10.7275/1942731
dc.identifier.urihttps://hdl.handle.net/20.500.14394/47558
dc.relation.urlhttps://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1719&context=theses&unstamped=1
dc.source.statuspublished
dc.subjectgap acceptance
dc.subjectcritical gap
dc.subjectgap
dc.subjectdriver behavior
dc.subjecttraffic safety
dc.subjectCivil Engineering
dc.titleSafety and Operational Assessment of Gap Acceptance Through Large-Scale Field Evaluation
dc.typeopen
dc.typearticle
dc.typethesis
digcom.contributor.authorisAuthorOfPublication|email:stevenmtupper@gmail.com|institution:University of Massachusetts Amherst|Tupper, Steven Maxwell
digcom.date.embargo2011-04-15T00:00:00-07:00
digcom.identifiertheses/651
digcom.identifier.contextkey1942731
digcom.identifier.submissionpaththeses/651
dspace.entity.typePublication
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