Principle 2: Frequency

A strong, legible and dependable network core requires schedule-free transfer opportunities, which in turn depend on frequent vehicle runs on every route component of the network core.

What defines a good ‘forget-the-timetable’ frequency depends on the network core’s trip-leg structure. This requires determination of acceptable travel time budget, number of transfer(s) required and reasonable Public Transport-to-Private Transport-Travel-Time (TT) ratio (universally assumed to be 1.5).

Bare-minimum frequency should be even lower for public transport modes that involve considerable walking times between elevated or underground stops and platforms (applicable for modes that require grade-separated transfers, such as LRT/MRT/BRT and trams/buses on free-flowing roads).


Frequency setting depends on network trip-leg structure