Abstract
The following report presents tabulations and statistical comparisons of the accident and conviction records of 40, 399 Mature Driver Improvement (MDI) course participants, aged 55 and above, and a randomly selected sample of 75, 064 drivers in the same age range. Results of the six- month post- course statistical comparisons indicate that MDI course graduates had significantly lower rates of fatal or injury accidents and traffic convictions than had comparison drivers.