Working principle of school bus stop sign

The working principle of school bus stop sign is to use parking control switch to control the opening and closing of stop sign. When the driver needs to stop to get on or off the students, he or she will turn off the parking control switch, which will trigger a circuit to make the warning light on the parking sign flash and beep. When the school bus is ready to start, the driver only needs to turn off the parking control switch. If the driver forgets to turn off the parking control switch after starting, when the vehicle speed is more than 5km/h, the signal output end of the vehicle speed sensor will output the vehicle speed signal to the speed controller, and the speed controller will control the stop sign to turn off.