Throughout the world, the reliability of public transport systems is constantly under review. Questions of reliability are particularly applicable to bus services, as they commonly share road space with other vehicles.
Public transport interchanges facilitate transfers between a wide range of motorised and nonmotorised transport modes, allowing users to move from feeder modes such as walking, cycling, private vehicles and local feeder buses to rapid transit, high volume modes such as heavy rail, light rail and busways. The efficiency of this transfer, and the size of the catchment, impact the effectiveness of the broader transport network.
As public transport agencies increasingly adopt the use of automatic data collection systems, a significant amount of boarding data becomes available, providing an excellent opportunity for transit planners to access spatial-temporal data which can be used for a better understanding of human mobility and the performance of a transit system. Smartcard data can be used to examine a whole network regularly, and to make practical estimates of passenger origin-destination (OD) patterns and is a great asset in understanding public transport reliability issues.