Full scale crash tests and sled tests have been conducted with test dummies unrestrained or partially restrained by personal occupant restraints (belts). In the tests in which the test dummy was partially restrained, the retractor lock was made inoperable. When the tests involving a partial restraint or nonrestrained condition were compared as a group with tests in which the test dummy was fully restrained by a properly operating three point belt system, the vehicle interiors in the reported tests received damage and the belts demonstrated marks that were similar in some respects, but distinctively and predictably different in others.