US Road Trip Rules — Speed, Phone & DUI Laws for Every State You Cross

Americans think of driving law as one rulebook, but it changes every time you cross a state line — the speed limit jumps, the phone law flips, the seatbelt rule tightens. This tool lines up every state on your route so the differences are obvious at a glance. Pick the states you will drive through and see the speed limits, handheld-phone rules, DUI thresholds, right-on-red and more, side by side.

Sources: TyreMap US state database · last verified 2026-07-13. State laws change — confirm anything safety-critical with the state DMV before you rely on it.

What this tool checks in each state

For every state you add, it pulls the rules that most often catch out-of-state drivers off guard:

• Speed limits — interstate, urban and residential, in mph. They range from 55 up to 85.
• Handheld phone law — whether handheld use is banned outright, hands-free only, or unrestricted (but texting is banned essentially everywhere).
• DUI limit — the 0.08 standard, plus the stricter under-21 threshold, which varies by state.
• Right turn on red — permitted after a stop in most states, but not all.
• Seatbelt enforcement — primary (you can be pulled over just for it) vs secondary.
• Move-over law, headlight rule and studded-tyre rules — the details that vary quietly from state to state.

Why a multi-state road trip needs this

Single-state guides are easy to find, but a real US road trip crosses lines — and the rules change the moment you do. The classic drives make the point: Route 66 runs through eight states, each with its own speed and phone rules; the Pacific Coast links California, Oregon and Washington, which differ on handheld phones; a Southwest parks loop through Nevada, Arizona and Utah mixes 80-mph interstates with tight canyon roads. Lining the states up side by side is the only way to see where a rule flips under you.

Frequently asked questions

Do driving laws really change between states? Yes — speed limits (55–85 mph), handheld-phone bans, seatbelt enforcement, move-over and right-on-red rules all vary. Only the 0.08 DUI limit is nationwide, though the under-21 threshold differs.

Highest speed limit? Texas, with stretches at 85 mph. Several western states hit 80; Hawaii is lowest at 60.

Can I use my phone? Depends on the state — many require hands-free and ban handheld use, a few have no statewide handheld ban. The tool shows each state on your route.

Is right on red allowed everywhere? Almost — after a full stop unless a sign says otherwise. New York City is the classic exception.