speedway

1. A form of motorcycle racing on flat (without camber) oval dirt tracks using motorcycles with neither brakes nor gears. (uncountable)
2. A form of bicycle racing on flat (nonbanked) oval dirt tracks. (uncountable)
3. A racetrack venue designated especially for the sport of auto racing. (countable, uncountable)
4. A positive-camber banked oval racing circuit, designed for high speed cornering, racing anywhere on the length of the track. (countable, uncountable)
5. A size of paved banked oval racetrack, smaller than superspeedways, but larger than a mile. (countable, uncountable)
6. A road for high speed traffic; an expressway. (US, countable, uncountable)

Plural speedways