PURPOSES : The main purpose of this study is to identify directions for improvement of triangular islands installation warrants through analysis of the characteristics of crashes and severity with and without triangular islands on intersections.
METHODS : The data was collected by referring to the literature and analyzed using statistical analysis tools. First, an independence test analyzed whether statistically significant differences existed between crashes depending on the installation of triangular islands. As a result of the analysis, individual prediction models were developed for cases with significant differences. In addition, each crash factor was derived by comparison with each model.
RESULTS : Significant differences appeared in the "crash frequency of serious or fatal" and "crash severity" owing to the installation of triangular islands. As a result of comparing crash factors through the individual models, it was derived that the differences were dependent on the installation of the triangular islands.
CONCLUSIONS : As a result of reviewing previous studies, it is found that improving the installation warrants of triangular islands is reasonable. Through this study, the need to consider the volume and composition ratio of right-turn vehicles when installing a triangular island was also derived; these results also need to be referred to when improving the triangular island installation warrants.

ABSTRACT
1. 서론
    1.1. 연구의 배경 및 목적
    1.2. 연구의 범위 및 방법
2. 선행연구 고찰
    2.1. 삼각교통섬에 관한 연구
    2.2. 사고 추정에 관한 연구
    2.3. 시사점 및 차별성
3. 분석 데이터 구축
    3.1. 데이터 수집
    3.2. 데이터 전처리
    3.3. 데이터 구축 결과
4. 삼각교통섬 설치 여부에 따른 사고 차이 분석
    4.1. 방법론 및 가설 설정
    4.2. 가설 검정 결과
5. 삼각교통섬 설치 여부별 사고 모형 개발
    5.1. 방법론
    5.2. 중상 이상 사고발생건수 예측모형 구축
    5.3. 사고심각도 예측모형 구축
    5.4. 소결
6. 결론
REFERENCES

• 기한솔(인천대학교 일반대학원 건설환경공학과 박사과정) | Gi Hansol
• 김응철(인천대학교 도시과학대학 도시환경공학부 교수) | Kim Eungcheol Corresponding Author