Uncovering the influence of commuters’ perception on the

5 The dominant method for measuring values of travel time savings (VOT), and values of travel time 6 reliability (VOR) is discrete choice modeling. Generally, the data sources for these models are: stated 7 choice experiments, and revealed preference observations. There are few studies using revealed prefer8 ence data. These studies have only used travel times measured by devices such as loop detectors, and 9 thus the perception error of travelers has been largely ignored. In this study, the influence of commuters’ 10 perception error is investigated on data collected of commuters recruited from previous research (1, 2). 11 The subjects’ self-reported travel times from surveys, and the subjects’ travel times measured by GPS de12 vices were collected. The results indicate that the subjects reliability ratio is greater than 1 in the models 13 with self-reported travel times. In contrast, subjects reliability ratio is smaller than 1 in the models with 14 travel times as measured by GPS devices. 15