Yet, bicycle helmets aren't designed to protect one's head in anything other than a simple fall. In fact, the CPSC (Consumer Products Safety Commission) impact

Yet, bicycle helmets aren't designed to protect one's head in anything other than a simple fall. In fact, the CPSC (Consumer Products Safety Commission) impact test standard only tests for a guided free fall from a height of about 6.5 feet. That's not sufficient to protect one in a crash with a motor vehicle. If seatbelts were only designed to protect in a frontal collision speed of 15 mph, then they won't provide any protection in a 45 mph crash.