In this paper, considering the characteristics of the driver at roundabouts by investigating the critical gap acceptance on various traffic conditions, multi-legged roundabouts were evaluated. The gap acceptance and rejection of 4-legged, 5-legged, 6-legged, and 7-legged roundabout were surveyed on real fields, and the critical gap acceptance was estimated using Raff's methods. Derived the critical gap acceptance was processed calibration and validation for micro-simulation, and then

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... d roundabouts under variable conditions such as variations of traffic volume, turning ratio, and size of inscribed circle diameter were evaluated to verify operating conditions of roundabouts. As the results, according to the operating traffic volume and turning ratio, the inscribed circle diameters were proposed at each level of service. These inscribed circle diameters were able to reflect the guideline of geometric design for multi-legged roundabouts. ■ keyword :|Multi-legged Roundabout|Critical Gap Acceptance|Calibration and Validation|Roundabout Design| * 본 논문은 한국콘텐츠학회 JCCC 2013 제1회 융합콘텐츠 제주학술대회 우수논문입니다. * 본 연구는 한국연구재단의 기초연구사업(일반연구자지원사업) "교통량 조건을 고려한 다지교차형태의 회전교차로 상세 설계방안(3차년도)" 연구비 지원에 의해 수행되었음.