Travel Time Reliability to Airport: Review and Assessment

Abstract

Researches related to travel time reliability (TTR) and variability were commenced in the late 70s and still are regarded as few of the indefinite fields in travel time related studies. Former outlines the probability of reachability and the latter, one of the least explored areas, highlights the inconsistency of travel time. According to the definitions of reliability stated in different studies, researchers always preferred to rationalize it as measure of user perception. This paper reviews the existing researches on network TTR, user based TTR, variability, and travel behaviour with special reference to airport access. It also compares mean variance and scheduling models, studied and assessed by various researchers, in addition to other models used in the evaluation of TTR. The results and conclusions of models on the respective networks are critically investigated as well. The study findings brought about a substantial evidence on the importance of value of time (VoT), value of reliability (VoR) and reliability ratio (RR) on different networks such that the user perception changes substantially upon the change in network characteristics. It is found out that there is a huge research gap in understanding the differences between perceived and actual reliability. Also, we have very little contribution towards reliability in accessing airports where purpose of the trips become significant.