The term 'road edge' can be defined as the area between a road and the adjacent land, such as a sidewalk or grassy area. The crossword solution for this term is 'SHOULDER, ' which refers to the part of the road that is slightly raised and runs along the edge of the road. This raised area is designed to provide a safe place for pedestrians and cyclists to walk or ride, and also serves as a buffer between the road and the adjacent land.