Road signs
easyYIELD / MERGE / STOP / DETOUR
Standard highway directions and warnings.
Answers
Full category names, the four words in each group, and a short explanation of the logic.
YIELD / MERGE / STOP / DETOUR
Standard highway directions and warnings.
CHIPS / SODA / GUM / JERKY
Typical convenience-store picks from a road trip stop.
ZION / YOSEMITE / ACADIA / OLYMPIC
Big-name American parks and wilderness destinations.
AREA / STOP / ROOM / EASY
They finish phrases like rest area, rest stop, rest room, and rest easy.