Often confused with a child restraint law, a seat belt law covers the use of a vehicle's built-in safety belt by drivers and passengers, while a child restraint law governs car seats, booster seats, and other age- or size-based restraints for children. Put simply, seat belt laws deal with the belt already in the car; child restraint laws deal with the extra equipment younger passengers may legally need.

A seat belt law sets who must buckle up, where in the vehicle the rule applies, and what penalties can follow for not doing it. In Delaware, the Delaware Code Title 21, § 4802 requires seat belt use for drivers, front-seat passengers, and many rear-seat passengers, with separate rules for children under Delaware's Occupant Protection requirements. That matters on busy roads like US-202 Concord Pike, where stop-and-go crashes are common, and on high-speed corridors like US-13, where injuries can be severe.

For an injury claim, seat belt use can affect how an insurer or defendant argues about damages. A failure to buckle up does not usually decide who caused the crash, but it may become part of a comparative negligence argument or a dispute over whether some injuries were made worse. Police reports, medical records, and traffic citations often end up doing more work here than people expect.