Method for Controlling U-turn Car Flow at Roundabout Based on Signal Control

With the increase of roundabout traffic, traffic has become more and more serious. Traffic design and signal control are effective measures to alleviate and improve traffic. Through analyzing traffic flow at roundabout and taking measures, three car flows, including right, straight and left, can be controlled to drive in roundabout lanes. However, there are some difficulties in controlling u-turn car flow. For this reason, this paper introduces some measures respectively in the roundabout and out of the roundabout based on signal control methods.