Mountain biking has plenty of downhill segments. In fact, there is an entire category of the sport conveniently named Downhill. Downhill racing can definitely

Mountain biking has plenty of downhill segments. In fact, there is an entire category of the sport conveniently named Downhill. Downhill racing can definitely be dangerous, but it is my belief that the people who do it are much more experienced than your casual "let's go down this road really fast" amateur on a road bike. Looking down a downhill mountain bike track and set off at full speed takes guts, and no one in their right mind does it without knowing the trail. Also, there are no cars on mountain bike trails.