Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes

Highway safety on mountain passes is a major concern to most highway agencies in the Western United States. Large trucks are known to be disproportionately affected on downgrades which characterize mountain passes in comparison to other vehicle classes. However, downgrade crash risks are known to ex...

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Autores principales:	Milhan Moomen, Mahdi Rezapour, Mustaffa Ngah Raja, Khaled Ksaibati
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2019
Materias:	highway safety downgrades warning signs safety effectiveness Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/5bac6fb9226d436aac98809558e36aec
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spelling	oai:doaj.org-article:5bac6fb9226d436aac98809558e36aec2021-11-04T15:51:55ZEvaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes2331-191610.1080/23311916.2019.1580405https://doaj.org/article/5bac6fb9226d436aac98809558e36aec2019-01-01T00:00:00Zhttp://dx.doi.org/10.1080/23311916.2019.1580405https://doaj.org/toc/2331-1916Highway safety on mountain passes is a major concern to most highway agencies in the Western United States. Large trucks are known to be disproportionately affected on downgrades which characterize mountain passes in comparison to other vehicle classes. However, downgrade crash risks are known to exist also for several other classes of vehicles such as buses, single-unit trucks, recreational vehicles (RVs) and passenger vehicles. The Wyoming Department of Transportation (WYDOT) in an effort to reduce the crash risks existing on Wyoming mountain passes has among other measures installed warning signs on steep grades in the state. However, concerns for out of control vehicles on downgrades persists. An empirical analysis of the safety performance of static warning signs installed two-lane road downgrades was carried out using the negative binomial (NB) modeling approach. A review of the literature indicated that there are unique contributory factors to truck and non-truck crashes. Two crash prediction models were therefore developed each for truck and other vehicles. In an attempt to approach the study holistically and to derive reliable results, traffic and geometric factors were included in the analysis. The results showed that truck escape ramp, directional and speed combination, and hill combination warning signs are effective in reducing truck crashes on downgrades. For non-truck crashes, the presence of downgrade and truck-specific warning signs within 0.5 miles of the downgrade, hill, chevron, and directional and speed combination warning signs reduce crashes to various degrees. It is hoped that this study will provide important information to traffic safety engineers and policymakers concerned with downgrade safety.Milhan MoomenMahdi RezapourMustaffa Ngah RajaKhaled KsaibatiTaylor & Francis Grouparticlehighway safetydowngradeswarning signssafety effectivenessEngineering (General). Civil engineering (General)TA1-2040ENCogent Engineering, Vol 6, Iss 1 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	highway safety downgrades warning signs safety effectiveness Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	highway safety downgrades warning signs safety effectiveness Engineering (General). Civil engineering (General) TA1-2040 Milhan Moomen Mahdi Rezapour Mustaffa Ngah Raja Khaled Ksaibati Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes
description	Highway safety on mountain passes is a major concern to most highway agencies in the Western United States. Large trucks are known to be disproportionately affected on downgrades which characterize mountain passes in comparison to other vehicle classes. However, downgrade crash risks are known to exist also for several other classes of vehicles such as buses, single-unit trucks, recreational vehicles (RVs) and passenger vehicles. The Wyoming Department of Transportation (WYDOT) in an effort to reduce the crash risks existing on Wyoming mountain passes has among other measures installed warning signs on steep grades in the state. However, concerns for out of control vehicles on downgrades persists. An empirical analysis of the safety performance of static warning signs installed two-lane road downgrades was carried out using the negative binomial (NB) modeling approach. A review of the literature indicated that there are unique contributory factors to truck and non-truck crashes. Two crash prediction models were therefore developed each for truck and other vehicles. In an attempt to approach the study holistically and to derive reliable results, traffic and geometric factors were included in the analysis. The results showed that truck escape ramp, directional and speed combination, and hill combination warning signs are effective in reducing truck crashes on downgrades. For non-truck crashes, the presence of downgrade and truck-specific warning signs within 0.5 miles of the downgrade, hill, chevron, and directional and speed combination warning signs reduce crashes to various degrees. It is hoped that this study will provide important information to traffic safety engineers and policymakers concerned with downgrade safety.
format	article
author	Milhan Moomen Mahdi Rezapour Mustaffa Ngah Raja Khaled Ksaibati
author_facet	Milhan Moomen Mahdi Rezapour Mustaffa Ngah Raja Khaled Ksaibati
author_sort	Milhan Moomen
title	Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes
title_short	Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes
title_full	Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes
title_fullStr	Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes
title_full_unstemmed	Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes
title_sort	evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on wyoming mountain passes
publisher	Taylor & Francis Group
publishDate	2019
url	https://doaj.org/article/5bac6fb9226d436aac98809558e36aec
work_keys_str_mv	AT milhanmoomen evaluatingthesafetyeffectivenessofdowngradewarningsignsonvehiclecrashesonwyomingmountainpasses AT mahdirezapour evaluatingthesafetyeffectivenessofdowngradewarningsignsonvehiclecrashesonwyomingmountainpasses AT mustaffangahraja evaluatingthesafetyeffectivenessofdowngradewarningsignsonvehiclecrashesonwyomingmountainpasses AT khaledksaibati evaluatingthesafetyeffectivenessofdowngradewarningsignsonvehiclecrashesonwyomingmountainpasses
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Evaluating the safety effectiveness of downgrade warning signs on vehicle crashes on Wyoming mountain passes

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