| Title |
Crash Clearance Time Analysis of Korean Freeway Systems using a Cox Model |
| Authors |
정연식(Chung, Younshik) ; 김선중(Kim, Seon Jung) |
| DOI |
https://doi.org/10.12652/Ksce.2017.37.6.1017 |
| Keywords |
고속도로 교통사고;사고 처리시간;혼잡 완화;생존모형;Cox 모형 Freeways traffic crash;Crash clearance time;Congestion mitigation;Survival analysis;Cox model |
| Abstract |
Duration induced by freeway crashes has a critical influence on traffic congestion. In general, crash duration composes detection and verification, response, and clearance time. Of these, the crash clearance time determined by a crash clearance team has attracted considerable attention in the freeway congestion management since the interest of the first two time stages faded away with increasing ubiquitous mobile phone users. The objective of this study is to identify the critical factors that affect freeway crash clearance time using a Cox's proportional hazard model. In total, 6,870 crash duration data collected from 30 major Korean freeways in 2013 were used. As a result, it was found that crashes during the night, with trailer or larger size truck, and in tunnel section contribute to increasing clearance time. Crashes associated with fatality, completed damage of crashed vehicle (s), and vehicles' fire or rollover after crash also lead to increasing clearance time. Additionally, an increase in the number of vehicles involved resulted in longer clearance time. On the other hand, crashes in the vicinity of tollgate, by passenger car, during spring, on flat section, and of car-facility type had longer clearance time. On the basis of the results, this paper suggested some strategic plans and mitigation measures to reduce crash clearance time on Korean freeway systems. |