What is the difference between a fence and a hurdle?

Fences and hurdles or, more correctly, ‘flights’ of hurdles, are obstacles to be negotiated in different types of National Hunt race and, consequently, differ in their construction, height and rigidity. Fences, which are used for steeplechase races, are the more substantial, higher and less yielding of the two. Steeplechase fences typically consist of a rigid steel or wooden frame, filled with artificial or real birch, cut to size and bound together. With the exception of a water jump, all steeplechase fences must be a minimum of 4’ 6” in height. By contrast, hurdles, which are used, unsurprisingly, in hurdle races, consist of individual, lightweight panels of cut brushwood, each at least 3’6” in height. The panels are driven into the ground, side-by-side, at an angle, to create a ‘flight’ of hurdles at least 30’ wide and at least 3’1” high.