(17-01275) Effect of Regional Characteristics on Crash Injury Severity of Local Buses Using a Hierarchical Ordered Model General Information Session :

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Presentation transcript:

(17-01275) Effect of Regional Characteristics on Crash Injury Severity of Local Buses Using a Hierarchical Ordered Model General Information Session : Timely Topics in Transit Safety and Security (663), 10/Jan/2017, 1:30-3:15(PM) Authors : Sangwon Yoon(Ph.D. candidate), Seung-Young Kho(Professor), Dong-Kyu Kim(Professor)* Affiliation : Dept. of Civil & Environmental Engineering, Seoul National University Research Summary Objective : To investigate regional effects influencing injury severity of local bus-involved crashes Model : Hierarchical ordered model (Random intercept model) Lower level (level 1) : Individual crash characteristics variables (8 variables) Upper level (level 2) : Regional characteristics variables (5 variabls) Data : Commercial vehicle crash data (27,731 crashes between 2010 and 2014) & Regional macro-level data (230 municipalities in South Korea)

Findings A 5.1% (ICC=0.051) regional effect on local bus crash injury severity Some negative regional characteristics influencing on local bus crash injury severity Poor road pavement and emergent medical environmet Low traffic rate of compliance High portion of the eldery Comparison of effects of regional characteristics among Bus Types (Intercity bus, Express bus and Chartered bus) Regional characteristics have little influence on inter-regional bus crashes A single-level model was recommended for inter-regional bus crashes Remarks Proving regional demographic and socioeconomic differences affect local bus crash injury severity