A freeway that is part of the Interstate Highway System.
Of, or relating to two or more states.
Crossing states (usually provincial state, but also e.g. multinational sense).
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.