Summary
This chapter provided a general definition of interchange as the act of transferring
between modes or between different services of the same mode, but also emphasized that
although the definition is clear, the ability to accurately identify interchanges using smart card
data is limited by a lack of information on journey purpose. Thus, an exploration of elapsed
times between journey stages for passengers using Oyster smart cards to travel by bus or
Underground on the TfL network was used to develop recommended elapsed time thresholds
for identifying interchanges across the network.