Bicycle accidents result in approximately 50,000 injuries in the United States each year. Though bicycles are quite different from cars and trucks, they are often required to share the road with them and obey the same traffic rules. In many accidents, driver’s claim they did not notice a cyclist or did so when it was too late to avoid an accident. When accidents occur, cyclists are vulnerable since they have little protection, though the use of a proper helmet can reduce head injuries. Reconstructing a bicycle accident often requires specific calculations to determine factors such as coasting speed down an incline, bicycle braking distances and the role of equipment failure.