U.S. seat belt laws may be subject to primary enforcement or secondary enforcement. Primary enforcement allows a peace officer to stop and ticket a driver if they observe a violation. Secondary enforcement means that a peace officer may only stop or cite a driver for a seat belt violation if the driver committed another primary violation (such as speeding, running a stop sign, etc.) at the same time. New Hampshire is the only U.S. state that does not by law require adult drivers to wear safety belts while operating a motor vehicle.