Not to mention that in a hard collision, it's likely the car surroundings trapping you, not the seat belt.... Anyone that thinks that it's safer to have your head getting hit harder than a football player without helmets on is safer in any regards
not exactly relating to seat belts..but theres a 19% increase in fatal crashes involving 16/17 year olds. my guess: cellphones/texting. http://cnn.com/video/data/2.0/video/us/2013/03/13/howell-dnt-teen-driving-deaths.cnn.html