Automatic ramp. The driver's control device. The system needs to work when the car stops. And sound or flashing lights in the display as the system is working.
The automatic ramp, riders control the device by the system to work when a car parked there and stop the audio signal or flashing lights showing on the system running khonthi.
Auto-ramp to the driver control the device by the system to be able to work when a car parking freezes and audio signal or light is flashing at the system is shown in b.