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In the evening, because of poor sight, through the mirror to see whether there are cars or cyclists after bending,it increased the risk of driving at night and it is very dangerous for many cyclists to ride on the mountain road. So mountain road turn indicator is to indicate whether there is a car after bending to improve the safety of driving. If the sensor to spot a vehicle, then the corresponding light will light up. According to the number of lights, display the distance to the car and then the driver can adjust the speed according to the situation and after see the light the rider can decelerate over ride, to ensure safety.