Understanding relationship between road median type and accident frequency

Journal article

Authors/Editors

Strategic Research Themes

Publication Details

Author list: Tassana Boonyoo;Thanapong Champahom;Kattreeya Chanpariyavatevong;Sajjakaj Jomnonkwao;Pongrid Klungboonkrong;Vatanavongs Ratanavaraha

Publisher: Faculty of Engineering, Khon Kaen University, Thailand

Publication year: 2021

Journal acronym: EASR

Volume number: 48

Issue number: 4

Start page: 466

End page: 475

Number of pages: 10

ISSN: 2539-6161

eISSN: 2539-6218

URL: https://ph01.tci-thaijo.org/index.php/easr/article/view/242109

Abstract

Road medians play an important role in the design of four or more lanes highways with high traffic volume and the large number of accidents. This study focused on effect of factors (such as traffic volume, road characteristics, land use and road median types) on the number of accidents. The data was collected from nationwide highway, and further used to build the models by using Generalized linear with Negative binomial model distribution classified by road median types including raised-, depressed-, flush- and barrier median. The result found that the increase in traffic volume and truck ratio are positively associated with more number of accidents in all four road median model. The finding also recommends that raised-, depressed- and flush median should be implemented within agriculture and rural area in order to decrease crashes frequency. The contributions of this study could be used as guideline regarding highways median type implementation decision-making to enhance road safety in Thailand.

Keywords

Accident frequency, Negative binomial model, Road median type, Road Safety, Road segment, Thai highway