The setting conditions of roundabout under different signal control methods
Dong Ruijuan Zhang Weihua
(School of Transportation Engineering, Hefei University of Technology, Hefei 230009)
Abstract: Based on the operational characteristics of vehicles at roundabout, it deduced the roundabout capacity formula of single and dual signal control in the stop line ways，in which the single signal control capacity was deduced from no conflict time and conflict time respectively, based on stop line way the capacity formula of dual signal control considered the ring road parking capacity. Then, comparatively analyze the conditions of implementing single or dual signal control from the perspective of capacity. And solve out the critical conditions of control mode selection under different radius of island ring, green time of phrase and flow rate of left-turn, which provide evidence for signal control mode selection of roundabout.
Key words: roundabout; capacity; single signal control; dual signal control; conflict point