How well do London buses match the timetables?

In rural and suburban areas, a bus may come at a very specific time, while urban and other busy areas may have timetables specifying that buses on a route should arrive at some constant interval. The blue line represents how often a bus should arrive at bus stops at the current time (TfL usually specifies a time range – e.g. 9 to 13 minutes). The data is also not complete – it includes only Bus Routes 1-50 and only displays those routes where the timetable states that a bus should arrive every x minutes at the current time.

Source: www.michalpaszkiewicz.co.uk