Risk-homeostatic processes in car following behaviour : electrodermal responses and verbal risk estimates as indicators of the perceived level of risk during a car-driving task.

There are several publications reporting the use of the Electrodermal Activity (EDA) as a measure of perceived risk in the traffic environment. However, the experiment, described in this report, showed that there are a number of practical and theoretical problems with regard to the use of this measure in the domain of applied traffic research. Besides a support of prior findings, profound analyses of the EDA measures showed that the Electrodermal Activity does not necessarily reflect the risk perceived by the automobile driver.