A Study of the Analysis on the Accident Reduction Effect of the Median

중앙분리대의 사고감소효과 분석에 관한 연구

  • Published : 2003.04.01

Abstract

A median is a safety feature most commonly used to separate opposing traffic on a divided highway. In designing highways, the selection and installation of a median can be a critical part from a safety viewpoint because road crossing accidents are definitely more serious than other accidents. In regard to the important function of the median. the proper countermeasure ought to have been provided and thorough study should have been carried out. In this paper, traffic accident data are analyzed to examine the accident reduction effect of the median, which are gathered from all over 4-lane national roads in Korea. The traffic accident data were categorized into two groups by the existence of a median. For more effective analysis, the data have been classified by accident type, severity. and occurrence time. To compare the effectiveness of median installation, not only the accident frequency but also the accident severity, EPDO. and the occupancy rate of specific accidents have been used as a mode of effectiveness. The analysis of the effectiveness of medians shows that both the accident frequency and the accident severity could decrease by providing a median. Also the section where a median was supplied showed the improvement of overall safety through fewer serious and fatal crashes as well as fewer head-on crashes. Therefore, conclusions can be drawn from results of this study that the median installation is an important means to increase the safety of over 4-lane national roads. This study is expected to provide the reasonability of the median installation by identifying the reduction of traffic accident after the median installation and to play a major role in selecting sections where the median is to be offered.

중앙선 침범 관련 사고는 다른 사고에 비해 사고빈도는 낮지만 치명적인 사고로 이어질 가능성이 높기 때문에 이에 대한 적절한 사고감소대책이 필요하다. 중앙선 침범을 방지하는 대표적인 도로안전시설물이라 할 수 있는 중앙분리대는 도로의 안전 확보에 중요한 역할을 하며, 실제 그 효과에 대한 구체적인 분석을 통하여 향후 중앙분리대의 적극적인 활용을 도모하는 것을 연구의 목적으로 하고 있다. 따라서 본 연구에서는 중앙분리대의 형식, 성능 등에 대한 검토에 앞서 기본적으로 중앙분리대의 설치와 교통사고와의 관계를 분석해 보았다. 즉, 중앙분리대의 사고감소효과를 파악하기 위해 우리나라 4차로 이상의 일반국도를 대상으로 중앙분리대 설치 여부에 따른 사고자료를 비교하였다. 보다 체계적이고 효과적인 분석을 위해 총 사고뿐만 아니라 유형별·사고강도별·시간대별 사고를 비교하였으며, 다양한 효과척도(사고율. 사고점유율. EPDO)를 이용하여 사고빈도뿐만 아니라 사고강도까지 비교하였다. 지점별·구간별 사고분석 및 중앙분리대 신설지점에 대한 효과분석 결과 중앙분리대의 설치는 사고빈도와 함께 사고강도를 낮춤으로써 확실한 사고감소효과를 가져왔으며, 특히 정면충돌사고, 사망사고, 야간사고에 대한 사고감소효과가 크게 나타났다. 따라서 정면충돌사고. 사망사고, 야간사고가 빈번히 발생하는 도로구간(특히 단일로나 접속로의 경우)에 대한 중앙분리대의 설치는 교통사고 감소를 위한 중요한 대책이 될 수 있다. 이러한 연구를 통해 중앙분리대 설치에 따른 사고감소효과를 명확히 밝힘으로써 중앙분리대 설치의 당위성을 제공할 수 있을 뿐 만 아니라 향후 보다 효과적이고 합리적인 중앙분리대 설치구간 선정에 도움을 줄 것으로 사료된다.

Keywords

References

  1. SPSS 10.0 매뉴얼(통계분석방법 및 해설) 이학식;김영
  2. 교통공학 원제무;최재성
  3. Swedish National Transport and Road Research Institute 2+1-Roads with cable barriers-Safety and traffic performance results Arne Carlsson
  4. Transportation Research Record 1581 Effect of median treatment on urban arterial safety: an accident prediction model Bonneson,J.A.;P.T.McCoy
  5. Transportation Research Record 1445 Effect of urban and suburban median types on both vehicular and pedestrian median types on both vehicular and pedestrian safety Bowman,B.L.;R.L.Vecellio
  6. Transportation Research Record 1784 Cross-median Collisions on Pennsylvania Interstates and Expressways Donnell,E.T.;D.W.Harwood;K.M.Bauer;J.M.Mason;M.T.Pietrucha
  7. Transportation Research Record 1500 Evaluation of flush medians and two-way, left-turn lanes on four-lane rural highways Fitzpatrick,K.;K.Balke
  8. Transportation Research Record 1758 Effect on crashes after construction of directional median crossovers Hunter,W.W.;J.R.Stewart;K.A.Eccles;H.F.Huang;Taylor,W.C.;I.Lim;D.R.Lightizer
  9. Transportation Research Record 1743 Three-stand cable median barrier in north carolina: in-service evalution F.M.Council;D.L.Harkey
  10. Transportation Research Record 1665 Effect of Midblock Access Points on Traffic Accidents on State High-ways in New Jersey Kyriacos C.M.;S.Wu;I.C.Steven;E.Arthur
  11. North Carolina Department of Transportation Raleigh Across Median Accident Study: A Comprehensive Study of Traffic Accidents Involving Errant Vehicles Which Cross the Median Divider Strips on North Carolina Highways Lynch,J.M.;N.C.Crow;J.F.Rosendahl
  12. Transportation Research Record 1758 Crossover Crashes at Median Strips Equipped with Barriers on a French Motorway Network Martin,J.L.
  13. California State Dept. of Transportation Effect of Plantings on Median Accidents - Final rept Moore,R.;C.D.Cutler
  14. Transportation Research Record 1239 Accident comparison of raised median and two-way left-turn lane median treatments Squires,C.A.;P.S.Parsonson