In Chapter 3, the following ranges of elapsed time thresholds for identifying
interchanges in the London network were proposed:
* Underground-to-bus interchanges from 15 to 25 minutes between Underground station exit
and bus boarding;
* bus-to-Underground interchanges, including bus in-vehicle time, from 30 to 50 minutes
between bus boarding and Underground station entry; and
* bus-to-bus interchanges, including bus in-vehicle time and waiting time for the second bus
stage, from 40 to 60 minutes from first bus boarding to second bus boarding.