The bus network is planned holistically to be affordable, go everywhere and be used by everyone.
Rather than measuring average delay times on buses, Transport for London (TfL) measures Excess Wait Time (EWT) for passengers. EWT is the difference between the scheduled waiting time and the average actual waiting time for bus routes. For the bus network North of the river, the EWT for high frequency routes combined was 0.97 minutes in 2018/19.
TfL uses the EWT metric because the majority of London’s network operates at ‘turn up and go’ frequencies. This means passengers are less likely to use timetables, making a reliable, evenly-spaced service more important.