PURPOSES : The turning movement of vehicles is directly affected by such factors as vehicle length, wheelbase, steering angle, articulated angle, and wheel steering. Therefore, it is necessary to analyze the impact of changes in each factor on the turning of the vehicle. Because a vehicle with a long body, such as an articulated bus, makes a wide turn, this study analyzes the swept path of the driving vehicle considering the specifications of the vehicle.
METHODS : This study was conducted by dividing driving routes into four routes of two-lane four-way roundabouts, and the turning conditions were examined for six types (Type 1–6) that simulated actual articulated bus data. The same vehicle specifications as those of the actual articulated bus were applied to the road design simulation (AutoTURN Pro), and the width of the swept path for the articulated bus was investigated based on the wheel steering control. Using a virtual reference line for dividing the inscribed circle into lanes of the roundabout by 5°, the driving width of the swept path was measured and the angle at which the driving width was largest during driving through the turning intersection was examined. In addition, the changes in the driving width of the swept path according to the wheel steering control under the same wheel turning conditions, as well as the articulated and steering angles, were investigated.
RESULTS : The driving width of the swept path for the vehicle (Type 1) with the front wheel control function being an all-wheel system was less than that of an articulated bus with the largest driving width of 15° after entering the roundabout and 15° before entering the roundabout (Type 2). Furthermore, although the specifications of the vehicles were the same, it was determined that Type 5 was superior to Type 6 after reviewing the driving width in light of changes in the steering and articulated angles.
CONCLUSIONS : The results of this study are expected to contribute to the field of road design considering traffic safety when large vehicles, such as articulated buses, turn on roundabouts or curved road sections.

ABSTRACT
1. 서론
2. 분석 개요
    2.1. 굴절 버스 주행 자료
    2.2. 굴절 버스 제원 및 구성
    2.3. 회전 교차로 구성 및 주행 시나리오
3. 분석 결과
4. 결론 및 향후 연구과제
REFERENCES

• 박재홍(한국건설기술연구원 도로교통연구본부 수석연구원) | Park Jaehong
• 윤천주(한국건설기술연구원 도로교통연구본부 수석연구원) | Yoon Chunjoo
• 노민형(한국건설기술연구원 도로교통연구본부 박사후연구원) | No Min Hyung
• 성정곤(한국건설기술연구원 도로교통연구본부 선임연구위원) | Sung Jung Gon Corresponding author