THIS IS A FOLLOW-UP STUDY OF THE DRIVER GROUP REPORTED IN 1958. THE ACCIDENT BEHAVIOUR OF 66 PROFESSIONAL DRIVERS WAS FOLLOWED OVER A PERIOD OF 10-27 YEARS. THE CONSTANCY OF THE ACCIDENT COEFFICIENTS AND THE PREDICTION POWER OF THE TEST VARIABLES WERE STUDIED WITH CORRELATIONS, FACTOR ANALYSES AND DISCRIMINANT ANALYSES. THE CORRELATION BETWEEN THE ACCIDENT COEFFICIENT (ACCIDENTS PER MAN PER YEAR) OF THE BASIC EIGHT-YEAR PERIOD AND THE FOLLOW-UP PERIOD OF NINE YEARS (AVERAGE) WAS 0.56, CORRESPONDING TO A RELIABILITY OF 0.72 FOR THE TOTAL EXPOSURE TIME. CORRELATIONS BETWEEN THE TEST VARIABLES AND ACCIDENT COEFFICIENTS FOR THE FOLLOW-UP PERIOD WERE ALMOST THE SAME SIZE AS IN THE BASIC PERIOD, EVEN THOUGH THE FOLLOW-UP PERIOD RANGED FROM 1 TO 20 YEARS FROM THE TIME OF TESTING. MULTIPLE CORRELATIONS BETWEEN THE ACCIDENT COEFFICIENT AND 18 TEST VARIABLES FOR THE BASIC, FOLLOW-UP AND COMBINED PERIODS WERE 0.75, 0.77 AND 0.81, RESPECTIVELY. THESE AND OTHER ANALYSES SHOWED THAT THE ACCIDENT BEHAVIOR OF PROFESSIONAL CITY DRIVERS IS VERY CONSTANT, AND THIS BEHAVIOR CAN BE PREDICTED WITH SPECIALLY PLANNED PSYCHOLOGICAL TESTS.(Author/publisher).
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