The objective of this project was to provide the Federal Motor Carrier Safety Administration (FMCSA) with a more complete understanding of the non-regulatory factors which make for safer commercial motor vehicle (CMV) drivers. Through the review of available literature, the relationship between the CMV driver and the motor carrier was explored with respect to safety outcomes. A tailored Haddon Matrix was used as a means to structure the literature and provide clear direction for the development of future intervention strategies. Haddon's Matrix provides a framework for identifying factors that influence an event by dividing the event in terms of timeframe (i.e., pre-event, event, and post-event) and the actors and/or environments involved in the event.