New-style automatic fare collection gates use automatic scan design, and automatic retractable flaps to replace turnstile gates. After passengers scan their ticket, the flap will automatically retract to let passengers through. The gates are also equipped with height sensors. Children under 115cm may pass through if accompanied by an adult. But the child should walk ahead of the adult through the gate. Do not let the child walk behind the adult to avoid being blocked or knocked over by retractable flaps.