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논문 기본 정보
- Type
- Thesis
- Author
- Adviser
- 권오훈
- Issue Year
- 2021
- Copyright
- 계명대학교 thesis is protected by copyright.
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Analysis for Influencing Factor on Ramp Crashes and
Evaluation for Countermeasures
Kwak, Hyun Jun
Department of Urban Planning and Transportation Engineering
Graduate School
Keimyung University
(Supervised by Professor Kwon, Oh Hoon)
(Abstract)
It is generally known that there are higher probability of crash at ramp segments because of rapid curvature changes. For this reason, drivers need careful attention when they enter or exit ramp segments. Furthermore, the ramp segment has a high probability of serious crashes because the driver''s speed change and road alignment changes rapidly. Trumpet ramp accounts for about 64% of ramp types and there have been 6,717 crashes on ramps, of which about 65% of crashes have occurred in trumpet ramp segments. To prevent crash occurrence, it is essential to effectively apply safety treatments based on comprehensive crash analysis for trumpet type ramp segments.
In this paper, various big data mining techniques (i.e. Multivariate Adaptive regression splines, Random Forest, Decision Tree and Text Mining) were applied to derive complex influencing factors on trumpet ramp segments. In addition, by organizing the safety measures applied and the crash reduction effect of each countermeasure, four major countermeasures were selected and the safety effects were evaluated.
When the speed limit of the truck is lowered from 60km/h to 40km/h on the interchange, the crash reduction effect is found to be about 53% to 79%. The safety effect is expected to be significant when applying exit ramp where truck rollover crash occur frequently.
Applying color-lane at entrance ramps was resulted in an crash reduction effect of about 52% in the trumpet loop connection. It is effective in improving safety due to the rapid curve section and complex path. Moreover, it was revealed that the color-lane is effective in inducing the driver''s deceleration.
It was found that reducing the number of lanes has crash reduction effects ranging from 52% to 71% with traffic volume of 32,000 vehicles/day or less, and is particularly effective at the exit and loop ramps. It is required a priority review for segments where road alignment changes rapidly.
Finally, widening lane line width is effective in preventing run-off crash occurrence by inducing a clear driving flow at the exit ramp. It is expected that widening lane line width found be effective in the daytime.
This study proposes a strategy to enhance safety on ramp segments. It is expected that this study could provide insights for designing ramp sections and utilizing safety plans.
Evaluation for Countermeasures
Kwak, Hyun Jun
Department of Urban Planning and Transportation Engineering
Graduate School
Keimyung University
(Supervised by Professor Kwon, Oh Hoon)
(Abstract)
It is generally known that there are higher probability of crash at ramp segments because of rapid curvature changes. For this reason, drivers need careful attention when they enter or exit ramp segments. Furthermore, the ramp segment has a high probability of serious crashes because the driver''s speed change and road alignment changes rapidly. Trumpet ramp accounts for about 64% of ramp types and there have been 6,717 crashes on ramps, of which about 65% of crashes have occurred in trumpet ramp segments. To prevent crash occurrence, it is essential to effectively apply safety treatments based on comprehensive crash analysis for trumpet type ramp segments.
In this paper, various big data mining techniques (i.e. Multivariate Adaptive regression splines, Random Forest, Decision Tree and Text Mining) were applied to derive complex influencing factors on trumpet ramp segments. In addition, by organizing the safety measures applied and the crash reduction effect of each countermeasure, four major countermeasures were selected and the safety effects were evaluated.
When the speed limit of the truck is lowered from 60km/h to 40km/h on the interchange, the crash reduction effect is found to be about 53% to 79%. The safety effect is expected to be significant when applying exit ramp where truck rollover crash occur frequently.
Applying color-lane at entrance ramps was resulted in an crash reduction effect of about 52% in the trumpet loop connection. It is effective in improving safety due to the rapid curve section and complex path. Moreover, it was revealed that the color-lane is effective in inducing the driver''s deceleration.
It was found that reducing the number of lanes has crash reduction effects ranging from 52% to 71% with traffic volume of 32,000 vehicles/day or less, and is particularly effective at the exit and loop ramps. It is required a priority review for segments where road alignment changes rapidly.
Finally, widening lane line width is effective in preventing run-off crash occurrence by inducing a clear driving flow at the exit ramp. It is expected that widening lane line width found be effective in the daytime.
This study proposes a strategy to enhance safety on ramp segments. It is expected that this study could provide insights for designing ramp sections and utilizing safety plans.
Contents
- 제 1 장 서론 11.1 연구의 배경 11.2 연구 목적 21.3 연구 범위 및 방법 3제 2 장 램프부 대책 적용 사례 및 선행연구 고찰 52.1 국내 램프부 교통안전대책 적용 현황 52.1.1 노면표시 관련 52.1.2 시설물 관련 72.1.3 기타 82.1.4 국내 램프부 교통안전대책 종합 102.2 국외 램프부 교통안전대책 적용 현황 112.2.1 교통운영 관련 112.2.2 기하구조 관련 132.2.3 노면표시 관련 162.2.4 시설물 관련 182.2.5 기타 202.2.6 국외 램프부 교통안전대책 종합 242.3 국내외 램프부 교통안전대책 사례 및 연구고찰 정리 27제 3 장 고속도로 램프사고 복합 영향요인 분석 283.1 복합 영향요인 분석의 필요성 283.2 분석방법론 313.3 데이터 설명 323.4 분석결과 333.4.1 기초통계 분석 333.4.2 랜덤포레스트(RandomForest) 373.4.3 MARS(Multivariate Adaptive Regression Splines) 413.4.4 최종 복합 영향요인 선정 44제 4 장 개선방안별 안전성 평가 464.1 교통안전대책 선정 464.2 Cross-sectional 기반 대책별 안전성 평가 474.2.1 화물차량의 제한속도 차등화에 따른 안전성 평가 474.2.2 컬러레인 적용 유무에 따른 안전성 평가 594.2.3 차로수 변화에 따른 안전성 평가 664.2.4 시사점 714.3 시뮬레이션 분석 기반 대책 안전성 평가 724.3.1 국내외 차선폭원 설치 운영사례 734.3.2 분석방법 744.3.3 차선폭 변화에 따른 운전자 주행행태 분석 784.3.4 고속도로 차선폭원 넒힘대책 적용방안 검토 80제 5 장 결론 815.1 결론 815.2 시사점 및 기대효과 835.3 향후 과제 85참고문헌 89영문초록 95국문초록 98
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