The term HIGHWAY OR BYWAY can be broken down into two crossword solutions: ROUTE (5 letters) and ROAD (4 letters). A highway is a major, multi-lane ROAD that is designed for high-speed travel. It is usually divided by a median strip and has access controlled by interchanges. Byways, on the other hand, are smaller roads that are typically used for local travel. They are often winding and may have limited access.