freeway

noun2

1. •
   (US) 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

   • Contrary to what one might expect of an essay on freeways, this one is neither a diatribe nor a paean. — 1983
2. •
   A toll-free highway.