You don???t need a seatbelt on trains which are travelling at 120 mph and if they crash you???re all dead.??? Also, he noted, ???If there ever was a crash on an aircraft, God forbid, a seatbelt won???t save you.??? If nothing else, however, pilots and air safety regulators point out that in the event of turbulence passengers are more likely to be injured when not wearing a seatbelt.