Limited research has addressed the issue of truck drivers and their performance regarding highway safety in terms of reduced number of crashes per driver. The primary purpose of this study was to determine how tractor trailer truck drivers' job performance could be improved while at the same time ensuring increased revenue for the transportation companies employing them. The target population for this study comprised of tractor-trailer truck drivers employed by a leading transportation company in the United States. The data used in the study included demographic, human capital, compensation and workplace variables. The results of this study should be useful to several individuals, organizations and the entire U. S. economy. The transportation companies should benefit by knowing the factors that predict good job performance for the drivers. This should assist management in designing work conditions or other activities that promote good performance in terms of reduced crashes and improved productivity of the drivers. (Contains 5 tables and 2 figures.)