The invention discloses an induction
signal control method for a ring-shaped intersection, comprising the following steps of: setting a ring circling vehicle arrival detection coil, a ring entering and ring surrounding vehicle queuing detection coil and a ring circling induction
signal lamp at the ring-shaped intersection; judging whether the arrival of the following ring circling vehicles is detected by the ring circling vehicle arrival detection coil within ring circling vehicle preliminary
green light time, if not, transforming phase, setting ring entering vehicle preliminary
green light time, if so, judging whether the queuing vehicle is detected by the ring entering vehicle queuing detection coil; if no queuing vehicle is detected by the ring entering vehicle queuing detection coil, prolonging ring circling
green light interval time, and if the queuing vehicle is detected by the ring entering vehicle queuing detection coil, transforming the phase, and providing ring entering preliminary green light time. With the control method, the priority of the ring circling vehicles can be ensured, when the vehicle
queue is too long, benefits of the ring circling vehicles and the ring entering vehicles can be balanced, so that the control method is suitable for random arrival of the traffic, and can thoroughly settle the conflict between the ring entering vehicles and the ring circling vehicles, reduce
delay of the traffic, alleviate traffic
jams and improve traffic safety.