GDLs had reduced deaths among teenage drivers in New Zealand, Australia and Canada, where versions of the system exist.
The first long-term study to investigate the benefits of each licensing stage was conducted in 2002 in Nova Scotia.
In 1996 Florida became the first state to enact a GDL law. History: To control the problem of young drivers accounting for a disproportionate number of motor vehicle crashes, each state has adopted one or more elements of a graduated drivers license (GDL) system.
Graduated licensing requires a more rigorous learning period before granting young people between the ages of 15 and 18 a drivers license with full privileges. Stage 1 (learners permit) requirements and recommendations include a vision test, a road knowledge test, driving accompanied by a licensed adult, seat belt use by all vehicle occupants, a zero BAC level, and six months with no crashes or convictions for traffic violations.
The risk increases 44 percent with one passenger; it doubles with two passengers and quadruples with three or more passengers.