In the section about a trip to take reservations for seats, which contains links to all stations or airlines. Make easy traveller who does not want to lose time is also used to regulate traffic, such as traffic lights system.
In connection with the trip. Uses a computer to book a seat, which is linked to all stations or all the airline. Making it easier for travelers who do not need to wait. It is also used to control traffic systems such as traffic lights.
In part on the journey. To use the computer in the book the seat which provides links to all stations, all of the airline. Makes it convenient to people who don't waste time waiting. It is also used in the control system of traffic.Traffic light.