But in recent years lightweight, single shaft, independent suspension, driving sulkies have been introduced. These allow safe high speed use in off-road conditions. The most recent designs are of the single shaft type, as proponents believe that this type gives the dog(s) greater freedom, less possibility of injury, and a quicker and easier training regime. A single shaft dog sulky, made of stainless steel tube and fitted with independent suspension and disc brakes, weighs a little under 18 kg. The highest speed so far recorded in one of these sulkies is 64.8 kilometers per hour. See also Dog carting Roadster (horse) Types of carriages References Animal-powered vehicles Carts Dog equipment Harness racing Horse driving