No abstract

Young drivers' accident involvement may be explained by a number of different factors, one of which is that they tend to overestimate their skill in driving a car. This study is based upon the assumption that the degree of overestimation is related to the type of training the driver has received. In an experiment, two different strategies for training have been compared with regard to their influence on estimated and actual driving skill, as well as the drivers' degree of overestimation of their own skill. One of the strategies, used in the "skill" group was to make the learner as skilled as possible in handling a braking and avoidance manoeuvre in a critical situation. The other strategy, used in the "insight" group was to make the driver aware of the fact that his own skill in braking and avoidance in critical situations may be limited and unpredictable. The experiment was carried out at the Bromma driving practice area in Stockholm. Low friction has been simulated by using "Skid Car" equipment. Fifty-three learner drivers were randomly divided into two groups. Each of the groups was taught on the basis of one of the strategies. The training session was 30 minutes long. One week later, the drivers returned to take part in a test of their estimated and actual skill. The "skill" group estimated their skill higher than the "insight" group. No difference was found between the groups regarding their actual skill. The results confirm the main hypothesis that the skill training strategy produces more false overestimation than the insight training strategy.

The present study provides normative data for the understanding of the development of visual search strategies among drivers. The methodology used in the present study, i.e., to combine a quantitative analysis with a qualitative analysis proved, to be useful to compare visual search strategies among inexperienced and experienced drivers.

Road accidents among professional drivers are a major problem in many companies. There are several traditional measures for improving safety, but knowledge about what measures are most effective is rather limited. The aim of the study is to compare four different measures for reducing accident involvement through changed driver behaviour. The measures are driver training, group discussions, campaigns and bonuses for accident free driving. Five groups of approximately 900 drivers each employed by the Swedish telephone company "Televerket have been used in the experiment. Four of the groups were test groups, where each took part in one of the measures. The fth group was a control group. The effect on accident risk (accidents in relation to mileage) and accident costs have been calculated for a period of 2 years after the measures were applied. The results show that group discussions and driver training with the rather unusual design used in the experiment succeeded in improving the accident risk compared to the control group. Accident costs were reduced in all four test groups, but not in the control group.