Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic

The aim of this study is to develop the power model of the relationship between speed and traffic safety. As the inter-urban roads are characterised with heterogeneous traffic, the heterogeneity became the focus of the analysis. The present study analysed the effects of various types of vehicles thr...

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Autores principales:	Siregar Martha Leni, Tjahjono Tri, Nahry
Formato:	article
Lenguaje:	EN
Publicado:	Institut za istrazivanja i projektovanja u privredi 2021
Materias:	speed change power model heterogeneous traffic speed ratio nilsson's power model inter-urban accident modification factor Technology T Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/c0e29c52ebf442a2b3a64bdacd5cfecf
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spelling	oai:doaj.org-article:c0e29c52ebf442a2b3a64bdacd5cfecf2021-12-05T21:23:13ZSpeed change and traffic safety power model for inter-urban roads with heterogeneous traffic1451-41171821-319710.5937/jaes0-29180https://doaj.org/article/c0e29c52ebf442a2b3a64bdacd5cfecf2021-01-01T00:00:00Zhttps://scindeks-clanci.ceon.rs/data/pdf/1451-4117/2021/1451-41172103854S.pdfhttps://doaj.org/toc/1451-4117https://doaj.org/toc/1821-3197The aim of this study is to develop the power model of the relationship between speed and traffic safety. As the inter-urban roads are characterised with heterogeneous traffic, the heterogeneity became the focus of the analysis. The present study analysed the effects of various types of vehicles through a number of speed change combinations and developed six equations: number of fatal accidents, number of fatalities, number of fatal and serious injury accidents, number of fatal or serious injuries, number of injury accidents and number of injured road users. The results indicated that the Power Model showed high predictability of the speed-accident relationship. The models fit the data well with Rsq in the range of 0.6-0.8. The vehicle category-specific ratio power models exhibited how traffic heterogeneity accounts for traffic safety. The equations' power varies with the types of vehicles, indicating the different sensitivity of accidents and casualties to the speed ratios. Overall, with the power estimates around one, except for all injured victims, the estimates were systematically smaller than those that were initially inferred in Nilsson's Power model. The values indicated that the increase in speed determined the increase in the number of accidents and casualties from year to year. The present study successfully developed the first speed-traffic safety Power Model for Indonesia. As it is exclusively dependent on the speed changes, the model can well describe the direction of change in traffic safety irrespective of other changes in the driving environment factors.Siregar Martha LeniTjahjono TriNahryInstitut za istrazivanja i projektovanja u privrediarticlespeed changepower modelheterogeneous trafficspeed rationilsson's power modelinter-urbanaccident modification factorTechnologyTEngineering (General). Civil engineering (General)TA1-2040ENIstrazivanja i projektovanja za privredu, Vol 19, Iss 3, Pp 854-862 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	speed change power model heterogeneous traffic speed ratio nilsson's power model inter-urban accident modification factor Technology T Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	speed change power model heterogeneous traffic speed ratio nilsson's power model inter-urban accident modification factor Technology T Engineering (General). Civil engineering (General) TA1-2040 Siregar Martha Leni Tjahjono Tri Nahry Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic
description	The aim of this study is to develop the power model of the relationship between speed and traffic safety. As the inter-urban roads are characterised with heterogeneous traffic, the heterogeneity became the focus of the analysis. The present study analysed the effects of various types of vehicles through a number of speed change combinations and developed six equations: number of fatal accidents, number of fatalities, number of fatal and serious injury accidents, number of fatal or serious injuries, number of injury accidents and number of injured road users. The results indicated that the Power Model showed high predictability of the speed-accident relationship. The models fit the data well with Rsq in the range of 0.6-0.8. The vehicle category-specific ratio power models exhibited how traffic heterogeneity accounts for traffic safety. The equations' power varies with the types of vehicles, indicating the different sensitivity of accidents and casualties to the speed ratios. Overall, with the power estimates around one, except for all injured victims, the estimates were systematically smaller than those that were initially inferred in Nilsson's Power model. The values indicated that the increase in speed determined the increase in the number of accidents and casualties from year to year. The present study successfully developed the first speed-traffic safety Power Model for Indonesia. As it is exclusively dependent on the speed changes, the model can well describe the direction of change in traffic safety irrespective of other changes in the driving environment factors.
format	article
author	Siregar Martha Leni Tjahjono Tri Nahry
author_facet	Siregar Martha Leni Tjahjono Tri Nahry
author_sort	Siregar Martha Leni
title	Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic
title_short	Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic
title_full	Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic
title_fullStr	Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic
title_full_unstemmed	Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic
title_sort	speed change and traffic safety power model for inter-urban roads with heterogeneous traffic
publisher	Institut za istrazivanja i projektovanja u privredi
publishDate	2021
url	https://doaj.org/article/c0e29c52ebf442a2b3a64bdacd5cfecf
work_keys_str_mv	AT siregarmarthaleni speedchangeandtrafficsafetypowermodelforinterurbanroadswithheterogeneoustraffic AT tjahjonotri speedchangeandtrafficsafetypowermodelforinterurbanroadswithheterogeneoustraffic AT nahry speedchangeandtrafficsafetypowermodelforinterurbanroadswithheterogeneoustraffic
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Speed change and traffic safety power model for inter-urban roads with heterogeneous traffic

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