A highway with grade-separated crossings (rather than level crossings) and designed (and only permitted) for high-speed motor-traffic (in Europe motor vehicles with a higher speed limit than 40 km/h) running in two directions on one separate carriageway each
A racetrack venue designated especially for the sport of auto racing.
The median strip or central reservation between lanes of traffic in a divided highway.
Used other than figuratively or idiomatically: see neutral, ground.