Same Idea, 50 Versions: How GDL Laws Vary by State

Graduated driver licensing is nationwide, but it isn’t national. Each state writes its own version, which means two teens the same age in different states can face very different rules. The Insurance Institute for Highway Safety (IIHS) and the Governors Highway Safety Association (GHSA) track these differences, and the spread is wide.

Understanding where states differ helps families know what to look up — especially if they move, or if a teen drives across state lines.

Where the variation lives

The three-stage structure is consistent. The knobs each state sets independently include:

• Minimum permit age. This ranges roughly from 14 to 16 depending on the state. A few states let teens start notably earlier than others.
• Permit holding period. Some states require six months with a permit before the next stage; others require a year.
• Required practice hours. Fifty hours is common, but the exact number — and how much must be at night — varies, and some states require fewer or more.
• Night-driving curfew. The restricted hours differ. One state’s curfew might start at 9 p.m., another’s at midnight.
• Passenger limits. Some states allow no young non-family passengers for the first months; others permit one; the duration of the limit varies too.
• Full-license age. When restrictions fully lift differs from state to state.
• Driver-education requirements. Whether (and how much) formal education is mandatory for minors is set state by state.

”Strong” vs. “weak” programs

Researchers often describe GDL programs as stronger or weaker based on how comprehensive their restrictions are. Programs with longer permit periods, firm night curfews, and strict early passenger limits tend to be associated with better safety outcomes. States periodically strengthen (or occasionally weaken) their rules, so the landscape shifts over time.

What this means for families

• Driving in another state? Your teen’s license is generally honored, but they’re expected to follow the road rules of the state they’re driving in. Some GDL restrictions travel with the driver; check before a road trip.
• Moving states? Don’t assume the new state’s rules match the old one’s. Requirements, restriction ages, and even which documents transfer can differ.
• Looking up rules? Your state’s BMV/DMV site is the authoritative source. IIHS and GHSA maintain helpful state-by-state comparison tables as starting points.

The shared logic makes GDL easy to understand in the abstract. The state-by-state details are what you actually have to comply with — so always verify against your specific state.

Rules vary by state and change over time. Confirm current requirements with the relevant state licensing agency.