30 per cent, on an average, and the risk of being killed by up to 40 per cent. The introduction of the crash helmet has brought about a change in the type of severe head injury caused by two-wheeler accidents. Before helmets were used, the type of injury often seen was an open linear or depressed fracture of the forehead under a severely lacerated scalp. Often, it was smeared with dirt from the road and there was rather localised brain damage.
Crash helmets prevent laceration of the scalp to a great extent. They also reduce the incidence of skull fractures and brain damage.