31. Front seats have active head restraints and their seat belts are equipped with pre-tensioners and force-limiters. 32. On the minus side, there are head restraints and shoulder belts for only two back-seat passengers. 33. Formula 1 and CART both require head restraints . 34. The head restraints don't look very strong either. 35. Among motorists with fixed head restraints , nearly half were out of position for the best protection. 36. He also felt NASCAR treated him unfairly last weekend by forcing him into a head restraint . 37. Called ROPS, or roll-over protection system, the hoops are folded down behind the standard head restraints . 38. In a rollover, a roll bar deploys and head restraints extend in less than a second. 39. New safety requirements included front seat head restraints . 40. He said it will cause drivers in all forms of motorsports to begin using head restraints .
