Harness racing use a standing start. The sulky (informally known as a "bike") is a light, two-wheeled cart equipped with bicycle wheels. The driver (not a "jockey", as in thoroughbred racing) carries a light whip chiefly used to signal the horse by tapping and to make noise by striking the sulky shaft. There are strict rules as to how and how much the whip may be used; in some jurisdictions (like Norway), whips are forbidden. For exercising or training, the drivers use what is known as a "jog cart," which is a sulky that is heavier and bulkier than a racing unit.
Harness racing of one mile (1,609 m). Most races are run on tracks constructed solely for harness racing (some with banked turns), but a few tracks conduct both harness and Thoroughbred flat racing. North American harness horses earn a "mark" (a record), which is their fastest "winning" time at that distance. Harness races involve a good deal of strategy. Though the vast majority of races are one mile, races are contested on several different size tracks. The most common are 1/2 mile, 5/8 mile, and 1 mile tracks. Certain horses are better on the smaller tracks and others are better on the