Vernier effect

the vernier effect arises in the clock timetable of the ÖPNV . It received its name in analogy to the vernier, which uses a similar effect for the increase of the accuracies from measuring instruments to the measurement of lengths and angles.

The vernier effect develops particularly in city centers on several times occupied distance sections, on which different lines operate with different clocks. It comes too much strongly varying vehicle futures. From this an uneven load of the assigned vehicles with passengers results.

The vehicles are particularly delay susceptible after a large course future. The vehicles are on the other hand particularly come prematurely susceptible after a small course future. Into consequence it can come to a group formation.


example

Linie 1; Taktzeit = 15 min -> vehicle kommt zur Minute 0/15/30/45 Linie 2; Taktzeit = 20 min -> vehicle comes to the minute of 7/27/47

daraus folgt die entsprechende Zugfolgezeit -> 7/8/12/3/15/2/13


Operating control systems ITCS can reduce this effect, as the drivers get appropriate timetable deviations communicated, in order to hold the distances in the framework.

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