harness racing

Harness racing is a form of horse-racing in which the horses race in a specified gait. They usually pull two-wheeled carts called sulkies, although races to saddle (trot monté in French) are still occasionally conducted, especially in Europe.
See more at Wikipedia.org...

Noun
1. a horse race between people riding in sulkies behind horses that are trotting or pacing
(synonym) harness race
(hypernym) horse race