Sport and recreation is a positive influence on the lives of children and youths. Bicycling is great for human health and getting/keeping in shape. It can be a part of physical activities or it can be a means of transportation. However, there are also risks, and bicycle accidents happen and can cause serious injury. Helmet use can substantially reduce the risks associated with bicycle injuries, as these protective devices can prevent an array of serious facial and cranial injuries. In this book, the authors present survey studies conducted in various settlements around the world, looking into the bicycle and helmet use of adolescents and young adults.