The electronic display shows the real-time "occupancy" situation of the toilets at Shanghai Hongqiao Railway Station.
A new smart-toilet system is being trailed at a railway station in Shanghai, reports Chinanews.com.
It's to solve the problem of long queues during national holidays and peak periods before.
Passengers at Shanghai Hongqiao Railway Station will now be able to see the real time 'occupancy' situation, and will be directed to the next available cubicle.
When the green light is on, it means the cubicle is ready for use. A red light indicates that the cubicle is in use.
A staff member at the railway station says the intelligent guidance system has been in use for around two weeks, making it easier and quicker for passengers to use the facilities.
If it proves a success, the smart system will be used for all the toilets in the station.