The lack of a link between vehicle location at the time of a transaction, or at any other time, makes
it difficult to link journey stages. Nonetheless, there is great value in forming complete
journeys based on elapsed time thresholds for the purposes of identifying and better
understanding passenger demand for bus interchanges as discussed in Chapter 2. Once a
network-wide dataset of complete journeys is generated, a bus network planner could then
quickly extract information for any subset of routes or stations without having to re-identify
complete journeys, which is computationally demanding. Examples of the application of these
types of extracts to bus network planning will be presented in Chapter 5.