The term HIGHWAY CROSSER can be broken down into two crossword solutions: OVERPASS (8 letters) and DEER (4 letters). An OVERPASS is a bridge or other structure that allows a road to pass over another road, railway, or waterway. DEER are hoofed mammals that are found in many parts of the world, including North America. Therefore, HIGHWAY CROSSER can be interpreted as an animal that crosses highways by using overpasses.