In a pilot study 20 drivers drove around a route and were classified into 4 classes-S, I, DA and DP (Safe, Injudicious, Dissociated Active, Dissociated Passive). Later these drivers took projective personality tests, questionnaire tests of intelligence and personality and 2 performance tests. Only one significant difference was found among the classes of drivers on results of the psychological tests-on the E (Extroversion) Factor of the questionnaire personality test.
Abstract