GDL (Graduated Driver Licensing)
A multi-stage licensing system for new drivers: permit → provisional → full license, each with progressively fewer restrictions.
Most US states use GDL programs to phase in driving privileges for teens. Typical stages: 1) Learner's permit (supervised only); 2) Provisional or intermediate license (limits on night driving and teen passengers); 3) Full unrestricted license. Stage transitions are based on age + clean-record + time-held thresholds.