A circuit describes the time during which and the route on which an individual vehicle operates.
Generally, the circuit starts whenever the vehicle drives out of the depot/garage and ends when it drives back in again. This vehicle can also be stationary temporarily, and then it generally continues its circuit. However, the vehicle can also temporarily drive back into the depot/garage and drive out again. In that case, the circuit stops or it starts again from scratch. Depending on the company, either the circuit is the same or there are two different ones. The identification procedure is as follows. There cannot be two circuits at the same time with the same ID. The individual sections of a circuit from terminus to terminus are journeys. Therefore, a circuit involves a vehicle driving out, carrying out several alternating journeys with turnaround times and driving back in.