41. Adjusting head restraints to prevent neck injuries. 42. More standards are being considered, including for head restraints , motorcycle brakes and pedestrian safety, the agency said. 43. In 2002, the institute released a study on head restraints that found 54 percent either good or acceptable. 44. A disgusted Spencer threw his head restraint device onto the track and walked away from his crumpled car. 45. Since their mandatory introduction in the late 1960s, head restraints have prevented or mitigated thousands of serious injuries. 46. Head restraints display the Y logo.47. The Expedition has no head restraints in the third row, whereas the Suburban and Sequoia have two each. 48. Other improvements include multistage front air bags, higher head restraints , seat belt pretensioners and an internal emergency trunk release. 49. And the " catcher's mitt " head restraint that fights whiplash injuries in the event of a rear-end collision. 50. The Mercedes also has multimedia screens for the back seat, embedded in the back of the front head restraints .
