Study on Gap Acceptance Behavior of Vehicles at Roundabout

抄録

Gap acceptance behavior highly influences the performance and safety of roundabouts. This study investigated the gap acceptance behavior of different vehicle classes at the roundabout through two parameters, critical gap and follow-up time. Vehicles were categorized into five classes. Class 2 has the lowest mean accepted and rejected gaps, 12.24 s and 1.87 s, respectively. Passenger cars following passenger cars had the longest follow-up time, with 2.75 s (morning) and 2.77 s (evening). At the same time, motorcycles following motorcycles had the smallest follow-up time values, with 0.85 s (morning) and 1.02 s (evening). Raff's method was used to calculate the vehicle critical gaps. Class 5 has the smallest overall critical gap, with 3.67 s., followed by Class 1 (4.82 s), 2 (6.00 s), and 4 (6.34 s). The findings can help in designing new roundabouts and developing capacity models.