Analysis of the variability of travel conditions along a transit line
BENEZECH ; COMBES ; LEURENT
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
BENEZECH ; COMBES ; LEURENT
Résumé / Abstract
Measuring and understanding service reliability from the users’ point of view is a major issue in transport planning. Indicators describing passengers’ transit experiences have been developed but they cannot directly be used in a frequency-based transit assignment software, through generalized cost, because they are always based on timetables. As well, these indicators make little case of on- board congestion. The objective of this paper is to introduce a stochastic model describing passenger travel conditions along a transit line, from the users’ perspective and in a frequency-based frame- work. Inter-arrival times are treated as random variables. The model is based on a simple assumption about successive headways that describe the way irregularity is propagated along the line. It yields analytical formulas for the distribution of passenger loads on all sections. An e ffi cient way of com- puting congestion costs for passenger is also described. Finally, the model is applied to a portion of a suburban rail line from the Paris region and orders of magnitude of the di ff erence between what operators measures and what passengers experience are derived.
