(Answered) : Backcountry trails in U.S. national parks, such as Yellowstone and Yosemite, have traditionally been open only to hikers and ho

Backcountry trails in U.S. national parks, such as Yellowstone and Yosemite, have traditionally

been open only to hikers and horses, not mountain bikes. At the urging of President G.W. Bush,

an avid mountain biker, the park service is considering opening some trails to mounpptain bikes

and creating some mountain-bike-specific trails, such as one in Big Bend National Park. This

issue is controversial, with opponents claiming that mountain bikes create trail erosion and

trample native plants. They also claim that mountain bikers disturb wildlife and other park users,

such as hikers, birders, and equestrians. Mountain bike proponents point out that properly

designed mountain bike trails do not create