The dissertation brings forward some factors that lie behind the predominantly negative attitude car-owners have toward tolls for road use. The greatest impact is tied to how fair people feel the tolls are: the less fair they are, the less likely people are to favor them. The sense of being deprived of personal freedom also affects peopleā€™s attitudes. People are more favorably inclined to other types of steering instruments that are not economic in nature, such as a zone where automobile traffic is banned in central Gƶteborg or information campaigns targeting the individual driver.

A field study showed that the impact of road tolls on driving habits was minimal. The only drivers who drove less were those households that got together to plan their trips. The fact that people do not drive their cars less even though they might have economic reasons to do so is not simply a matter of not wanting to or not having any alternatives. Many car trips are undertaken as a matter of routine, with no weighing of alternatives, with no conscious choice being made, and this is difficult behavior to change. On top of this there are a substantial number of unplanned trips, that is, trips we donā€™t normally make and didnā€™t plan on making. On the average, people make one such trip every day. The dissertation shows that these are primarily shopping trips, giving someone a ride somewhere (especially in families with children) and trips to the doctor, and households maintain that this unplanned driving is the result of unexpected events that are beyond their control.

Title of dissertation: Motivational and volitional control of private automobile use: the effectiveness of transport policies

Author: Cecilia Jakobsson, phone: +46 31-773 4253 (office)
e-mail: Cecilia.Jakobsson@psy.gu.se
External examiner: Dr. Linda Steg, Groningen
Time and place of public defense: Friday, April 2, 2004, at 1:00 p.m., Hall F1, Department of Psychology, Haraldsgatan 1, Gƶteborg