Take a seat / public transportation system

We design a system for public transportation. This system provide an easier way for passengers to recognize the seat which could be reserved.
This system connect to the ticket system. If the seat was reserved, the seat number show a yellow seat number. If the seat wasn't reserved, the seat number show a green chair.
The unreserved seat can prioritise for those who are old, disable, pregnant, or carrying child. It can be a practical design.