 In addition, although the seats originally installed by Ford remained attached to the floor and intact, none of the occupants were wearing seat belts at the time of the crash; the seat belts for the aftermarket seats were under the seats and inaccessible.As a result, the NTSB issued a recommendation to the National Highway Traffic Safety Administration, asking the National Highway Traffic Safety Administration to mandate minimum performance standards for aftermarket seats installed in vehicles modified into limousines.The NTSB also recommended that limousine operators encourage passengers to wear seat belts, and that mandated state inspections should check that seat belts are functional and accessible.