title: Experience of Mean Speed Related to Speeds over Parts of a Trip.
abstract: Subjects were asked to judge the mean speed of a model engine which travelled part of a fixed distance at one steady speed and the remainder at a different steady speed. Mean speed was consistently overestimated when compared with judgements of constant speed over the same distance, suggesting that the faster speed was given too much weight when an impression of mean speed was formed. This, and results reported earlier by the author, indicate that when a driver is allowed to speed up for short periods of time he may overestimate the effect of these spurts on his mean speed and travel time.
authors.affiliation: a Psychological Department , University of Stockholm , 113 85 Stockholm , Sweden.
authors.forename: O
authors.initials: O
authors.lastname: Svenson