Riding motorcycle helmet is to protect the head, an important protection tool for collision mitigation, do not wear or not wear the correct riding motorcycle helmet is very dangerous. In 2007, Japan had its domestic conducted a survey of traffic accidents, including motorcycle deaths in 19.9% of total traffic accidents, traffic accident injuries for 16.5% of the total number of people. The injured area to see from the deceased, head injuries accounted for 48.9%, accounted for 1.0% of facial injuries, neck injuries accounted for 8.2%, and car accidents than the very high proportion.
Motorcycle Helmets use is divided into four types according to 1 / 2 helmet cap body protection does not cover the ears; 3 / 4 helmet to 1 / 2 helmet cap body to extend the scope of protection to the ear; open helmet than 3 / 4 more extending down the side of helmet, half helmet referred to the three helmets. Full Helmet of the cap body, including eye protection, face and jaw parts, the shell and retaining jaw parts into one structure.
From the helmet to see the kinds and ratio of wounded, half helmet head vulnerable, full face helmets head is not vulnerable, it is mainly small range of semi-protection helmet covering the head are limited in scope, so only applies to riding slower and less small-displacement motorcycle tires.