What is "skidpan"

Skidpan \Skid"pan`\, n. See Skid, n., 1. [Eng.]

n. 1 A skidpad. 2 A shoe or clog, as of iron, attached to a chain, and placed under the wheel of a wagon to prevent its turning when descending a steep hill; a drag.

n. a paved surface on which cars can be made to skid so that drivers can practice controlling them