U.S. Traffic Laws That Vary Significantly by State

Most states now require drivers to use a hands-free device for calls, but several still permit holding a phone to your ear while driving. A smaller number ban handheld phone use only for younger drivers or in school zones. The laws also differ on what counts as a violation: some states treat a single touch to start a navigation app as an infraction, while others focus only on active voice calls.

Texting while driving is banned in the vast majority of states, but penalties range from a small fine to a point on your license that affects insurance rates. If you drive through multiple states regularly, it is worth reviewing each state's current statute rather than assuming your home-state habit transfers. See how phone use fits into the broader picture of distracted driving for more context on attention behind the wheel.

The right-turn-on-red rule is widely understood as a national default, but it has real exceptions. New York City prohibits it citywide unless a sign explicitly permits it. Some states allow local governments to post "No Turn on Red" signs at specific intersections, and those signs are often easy to miss, especially in an unfamiliar city. A handful of states also restrict the maneuver during certain hours or near schools.

Even where the turn is technically permitted, state laws differ on what you must do first. Some require a complete stop; others phrase the requirement as yielding to cross traffic. A complete stop is the safest default anywhere.

All 50 states have a move-over law requiring drivers to shift lanes or slow down when passing stopped emergency vehicles on the shoulder. The variation is in which vehicles are covered. Early laws covered police cars and ambulances. Most states have since expanded coverage to include tow trucks, highway maintenance vehicles, and utility workers. A few states extend protection to any vehicle with hazard lights active on the shoulder.

Penalties also vary. Some states treat a first violation as a minor fine; others classify it as a moving violation that adds points to your license. A small number allow license suspension for repeat offenses or for violations that cause injury.

The federal government removed national maximum speed limits in 1995, and states set their own. Rural interstate limits now range from 65 mph in several northeastern and midwestern states to 85 mph on a single Texas toll road. Most western states sit at 75 or 80 mph. That 15- to 20-mph spread is significant if you are cruise-controlling through multiple states on a single trip.

Some states also allow the posted limit to vary by time of day or by vehicle type. Large trucks and vehicles towing trailers face lower maximums than passenger cars in certain states, even on the same stretch of road.

Several states require headlights to be on whenever windshield wipers are running, regardless of visibility. The logic is that if it is raining hard enough to need wipers, other drivers benefit from seeing your lights. Other states have no such requirement, leaving it to driver judgment.

Daytime running lights, which activate automatically on most newer vehicles, do not always satisfy these requirements because they may not activate the tail lights. In a state with a wiper-headlights law, you may need to turn the full headlight switch on manually even if your car's automatic system is engaged.

Every state requires drivers to stop for a school bus that is loading or unloading children, but the rules around divided highways differ. Some states require drivers on the opposite side of a divided highway to stop. Others exempt them when the road is divided by a physical median. The definition of "physical median" varies too, with some states specifying a minimum width or the presence of a barrier.

Fines for violations range from under $200 to over $1,000 for a first offense, and several states have added automatic license suspension. Some school buses now carry cameras that capture plate numbers of passing vehicles, and citations can be mailed to registered owners.

Most drivers know they should signal before changing lanes, but states differ on how far in advance a signal is required. Common minimums are 100 feet, 200 feet, or "in time to warn other drivers," which is essentially undefined. A few states specify 300 feet in advance on roads above a certain speed limit.

Left-lane rules also vary. Some states require slower-moving traffic to keep right and actively prohibit using the left lane except to pass. Others only enforce this for vehicles moving below the flow of traffic. If you are driving through states with strict left-lane laws, staying in the right lane unless actively passing is both safer and legally cleaner. Intersections present their own rule variations worth understanding before driving somewhere unfamiliar.