Laws that require mandatory helmets for motorcyclists show results similar to those requiring seatbelts, studies have found. They decrease both the incidence and severity of head injury, whenever they are enacted. This is evident not only when such laws are implemented, but when they are repealed as well. More than half of all fatalities in motorcycle accidents are due to head injury and the death rates are significantly higher in states that have no mandatory helmet laws.
Study after study shows that incidences of head injury rise when helmet laws are repealed and fall when the laws are reinstated. Not only are such injuries reduced, but medical costs can be reduced by millions of dollars every year thanks to safety laws making the chance of injury so much lower than it otherwise would have been.
This still does not do much to help cyclists and pedestrians who have very little protection against motor vehicles. Pedal cyclists can also wear helmets, and those that do are far less likely to suffer head injury, according to doctors, not to mention fatal brain injury. A number of states have made the use of helmets for children mandatory and placed and emphasis on educating children and their parents on bicycle safety. Such measures have, of course, reduced the number of head injuries and fatalities in bicycle accidents. Even when head injuries do occur, they tend to be much less severe for helmeted bicyclists than for those who do not wear helmets.
Brain injury is common in accident which happen in Nassau and Suffolk Counties.