Definition of "speedway"

(uncountable) A form of motorcycle racing on flat (without camber) oval dirt tracks using motorcycles with neither brakes nor gears.  examples

(uncountable) A form of bicycle racing on flat (non-banked) oval dirt tracks.  examples

A racetrack venue designated especially for the sport of auto racing.

1. A positive-camber banked oval racing circuit, designed for high speed cornering, racing anywhere on the length of the track.

   1. A size of paved banked oval racetrack, smaller than superspeedways, but larger than a mile.  examples

(chiefly US) A road for high speed traffic; an expressway.  examples