Florida Seat Belt Law 316 . 314 ( 4 ) ( b ) specifically states : ( 3 ) As used in this section : ( b ) safety Beltran means a seat belt assembly that meets the requirements established under Federal Motor Vehicle Safety Standard No . 208 , 49 C . F . R . s . 571 . 208 . ( c ) unrestrained by a safety Beltran means being restricted by an appropriately adjusted safety belt which is properly fastened at all times when a motor vehicle is in motion . ( 4 ) It is unlawful for any person : ( a ) To operate a motor vehicle in this state unless each passenger and the operator of the vehicle under the age of 18 years are restrained by a safety belt or by a child restraint device pursuant to s . 316 . 613 , if applicable ; or ( b ) To operate a motor vehicle in this state unless the person is restrained by a safety belt .