Off-road vehicles are predominantly recreational and include motorcycles, minibikes, trail bikes, snowmobiles, dune buggies, all-terrain vehicles, hovercraft and possibly also motor boats. They are motorized and designed for travel on or over all forms of natural terrain. Their increasing popularity is leading to damage to soil and vegetation. Wildlife is harassed and its habitat disrupted. The distances one must travel to find terrain in which to use such vehicles encourages use of them in some places which are unsafe, where ecological damage can be caused, or which are otherwise unsuitable.
Experts in the Glacier National Park in the USA argue that use of a 4-wheel drive vehicle there would damage the ground for ten years, because the ecology is in such a delicate state of balance.