About 34 states plus DC allow police to pull you over solely for an unbuckled seatbelt (primary enforcement); the rest treat it as a secondary offense. Every state requires child restraints, but the age/weight cutoffs for rear-facing seats and booster seats vary — commonly rear-facing to at least age 2 and boosters required until around age 8 or 4'9" tall. Only about 15 states still require periodic vehicle safety inspections. Handheld phone bans now cover most of the country, though a handful of states still allow handheld calls while banning texting only.
At a glance
| Law type | Typical rule | Variation |
|---|---|---|
| Seatbelt enforcement | Primary in ~34 states + DC | Secondary enforcement in the remainder |
| Child car seat / booster laws | Rear-facing to ~age 2; booster to ~age 8 or 4'9" | Exact age/height/weight cutoffs differ by state |
| Periodic safety inspection | Required in roughly 15 states | Frequency (annual/biennial) and scope vary |
| Handheld phone use | Banned while driving in most states | A few states ban texting only, not handheld calls |
| Motorcycle helmet law | Universal in about 18 states | Partial (age-based) or no requirement elsewhere |
Seatbelt laws: primary vs. secondary enforcement
Every state requires seatbelt use, but how that law can be enforced differs. In primary-enforcement states, an officer can stop and ticket a driver solely because someone isn't buckled up. In secondary-enforcement states, the officer needs another reason to make the stop first — speeding, a broken taillight — before adding a seatbelt citation. This distinction matters because primary-enforcement states consistently show higher seatbelt usage rates, which is why NHTSA and most safety advocates push states to upgrade from secondary to primary laws.
Child car seat and booster seat requirements
All 50 states require some form of child restraint, but the specific age, weight, and height thresholds for switching from rear-facing to forward-facing, and from a harnessed seat to a booster, vary by state. Most states follow pediatric guidance recommending rear-facing until at least age 2, forward-facing with a harness through the preschool years, and a booster seat until a child reaches roughly 4 feet 9 inches tall or around age 8 — but the legal minimum in a given state can be lower than the safety recommendation. If you're moving or road-tripping across state lines with kids, check the destination state's specific statute rather than assuming your home state's rule travels with you.
Which states still require vehicle safety inspections
Periodic vehicle safety inspections — checking brakes, lights, tires, and steering for roadworthiness — used to be far more common but have been repealed in most states over the past few decades. Today only a minority of states, roughly 15, still mandate them, typically on an annual or biennial basis, sometimes only in certain counties. Separately, many states run emissions-only inspection programs that are unrelated to safety. If you're buying a used car from out of state, confirm whether your state requires a safety and/or emissions inspection before you can register it.
Distracted driving and phone-use laws
Nearly every state now bans texting while driving, and most have gone further to ban holding a phone at all while behind the wheel, requiring hands-free use instead. A small number of states still only restrict texting and haven't passed a broader handheld ban, and enforcement approaches (primary vs. secondary) vary the same way seatbelt laws do. Novice/teen drivers usually face stricter phone restrictions than the general adult population regardless of state.
Motorcycle helmet laws
Helmet requirements range from universal laws covering every rider regardless of age (in effect in roughly a third of states) to partial laws that only require helmets for younger or newly licensed riders, to a few states with no helmet law for adult riders at all. This is one of the widest legal gaps between states in vehicle safety law, and it directly affects insurance underwriting and injury outcomes.
Why this matters when buying or registering a car across state lines
Safety-law variation affects more than just tickets — it can affect insurance premiums, whether a car can pass registration in a new state, and what child-restraint gear you legally need before a road trip. If you're relocating or buying a vehicle to register in a different state than where you currently live, check that state's DMV or highway safety office site directly rather than relying on general knowledge, since thresholds get updated periodically.
This article summarizes general patterns across US states as of 2026 and is educational, not legal advice. Always verify current requirements with your state's DMV or highway safety office before relying on them.
Frequently asked questions
Which states don't require a seatbelt for adults in the back seat?
At what age can a child stop using a booster seat?
Do I need a safety inspection to register a used car?
Is talking on a handheld phone illegal in all states?
What happens if I move to a state with stricter safety laws?
Sources & further reading
- NHTSA — State Laws on Seatbelts and Child Passenger Safety
- Governors Highway Safety Association — State Law Database
- IIHS — State Law Facts on Vehicle Safety
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
