However, with the consent decrees expiring in 1997, manufacturers began making the 3 wheeled models once again, although very few of them marketed these days. Sport and Utility ATVsATVs are further divided into utility and sport markets. Sport ATVs are usually light and small 2 wheel drive vehicles, which have the ability of accelerating quickly, can be driven at speeds of up to 145 km per hour, or 90 miles per hour, have manual transmission, and are performance based. Utility models, on the other hand, are usually larger in size and are 4 wheel drive machines, which can achieve speeds of about 100 km per hour, or about 70 miles per hour. They are also capable of hauling small loads on racks that are attached to them or small dumpers. They can also be used for towing small trailers. Because of the difference in the weight of the two, each type of ATV has its own advantages on different terrains. Manufacturers have often been surprised by how ingenuously people adapt their quads to their farming requirements. The 6 wheel models are usually fitted with a small dumper, with a set of extra wheels at the rear end for increasing the payload capacity. These vehicles can either be 6 wheel drives or 4 wheel drives. All terrain Vehicles are very popular among bikes, cars and extreme sports enthusiasts.