Graduated driver licensing provisions: an analysis of state policies and what works.

Objective: To compare and contrast how specific graduated driver licensing (GDL) components have been implemented in different states and explore how the policies currently in place have affected state-level teen crash and mortality outcomes.

Methods: The study design involved a policy analysis using methodology set forth by Teitelbaum and Wilensky (2007). Eight states were selected, 2 each from 4 different regions in the United States.