A highway with grade-separated crossings (rather than level crossings) and designed (and only permitted) for high-speed motor-traffic running in two directions on one separate carriageway each
A toll-free highway.
An expressway, especially one designed for high speeds.
The primary mechanism used in the movement of electronic data or information; information superhighway.
A major route that carries most of the traffic going in a given direction by a specified mode of transportation.