PURPOSES: There are many recently constructed roundabouts in Jeollabuk-do province. This study analyzed how roundabouts reduce the risk of accidents and improve safety in the province.
METHODS: This study analyzed safety improvement at roundabouts by using an accident prediction model that uses an Empirical Bayes method based on negative binomial distribution.
RESULTS : The results of our analysis model showed that the total number of accidents decreased from 130 to 51. Roundabouts also decreased casualties; the number of casualties decreased from 7 to 0 and the seriously wounded from 87 to 16. The effectiveness of accident reduction as analyzed by the accident prediction model with the Empirical Bayes method was 60%.
CONCLUSIONS : The construction of roundabouts can bring about a reduction in the number of accidents and casualties, and make intersections safer.

1. 서론
  1.1. 연구의 배경 및 목적
  1.2. 연구의 내용 및 방법
 2. 기존 문헌 고찰
  2.1. 사고 및 심각도 분석
  2.2. 상충 감소
  2.3. 사고예측모형을 이용한 분석
  2.4. 계층분석법을 이용한 분석
  2.5. 소결
 3. 이론적 검토
  3.1. 사고 분석
  3.2. 일반화 선형모형(Generalized LinearModel)
 4. 안전성 분석
  4.1. 자료 수집
  4.2. 회전교차로 사전ㆍ사후 교통사고 특성
  4.3. 사고예측모형
 5. 결론
 REFERENCES

• 강규동(전주대학교 토목환경공학과 박사과정) | Kang Kuy Dong
• 권용석(전주대학교 토목환경공학과 교수) | Kwon Yong Seok 교신저자
• 김칠현(전주시 맑은물 사업본부 하수정비 계장) | Kim Chil Hyun