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Safety performance of curve advisory speed signs

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dc.contributor.advisor Dixon, Karen K.
dc.creator Avelar Moran, Raul Eduardo
dc.date.accessioned 2012-05-25T18:51:05Z
dc.date.available 2013-10-24T19:19:35Z
dc.date.copyright 2012-04-10
dc.date.issued 2012-04-10
dc.identifier.uri http://hdl.handle.net/1957/29376
dc.description Graduation date: 2012 en_US
dc.description Access restricted to the OSU Community at author's request from May 25, 2012 - May 25, 2013
dc.description.abstract Posting advisory speed signs at sharp horizontal curve sites is a practice well established in the United States. The purpose of these signs is to provide the driving public with a safe speed to negotiate such curves; however, the link between these signs and safety has not yet been clearly established. The first manuscript in this dissertation presents an effort to model safety as it relates to curve advisory speed signs. It proposes a statistical model relating crash frequency at 2-lane rural highways in Oregon to curve advisory speed signs and other influential factors. The Advisory Speed Crash Factor (ASCF) emerges as a sub-model that characterizes the safety effect of advisory speed signs. Results indicate that safety may be compromised if the advisory speed is either excessively prohibitive or excessively permissive. The second manuscript extends the use of the proposed ASCF to develop the OSU posting method, a new procedure that procures the "optimal" advisory speed derived from the ASCF. A field validation analysis, also presented in this manuscript, verified the meaningfulness of the proposed ASCF sub-model. The third manuscript outlines another methodology, named 'the Hybrid OSU Posting Method' in an effort to mitigate the well documented variability associated with using the Ball Bank Indicator (BBI). This method determines the advisory speed using the BBI in combination with the ASCF. Though benefits in safety performance and consistency resulted from using the Hybrid OSU method, this method is still outperformed by the computational OSU method. en_US
dc.language.iso en_US en_US
dc.subject advisory speed en_US
dc.subject safety en_US
dc.subject side friction demand en_US
dc.subject ASCF en_US
dc.subject optimal advisory speed en_US
dc.subject ball bank indicator en_US
dc.subject OSU posting method en_US
dc.subject.lcsh Traffic signs and signals -- Oregon -- Evaluation en_US
dc.subject.lcsh Speed limits -- Oregon en_US
dc.subject.lcsh Traffic safety -- Oregon en_US
dc.subject.lcsh Rural roads -- Oregon -- Safety measures en_US
dc.title Safety performance of curve advisory speed signs en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Civil Engineering en_US
dc.degree.level Doctoral en_US
dc.degree.discipline Engineering en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember Tumer, Irem
dc.contributor.committeemember Schafer, Daniel
dc.contributor.committeemember Hunter-Zaworski, Katherine
dc.contributor.committeemember Hurwitz, David
dc.description.peerreview no en_us
dc.description.embargo 2013-05-25
dc.description.embargopolicy OSU Users en

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