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Wiktionary
harness racing

n. A form of horse racing in which the horses race in a specified gait, usually pulling two-wheeled carts called sulky.

WordNet
harness racing

n. a horse race between people riding in sulkies behind horses that are trotting or pacing [syn: harness race]

Wikipedia
Harness racing

Harness racing is a form of horse racing in which the horses race at a specific gait (a trot or a pace). They usually pull a two-wheeled cart called a sulky, although in Europe racing under saddle (trot monté in French) is also conducted.