Think about total land area as units times size per unit. Roadsides stretch along nearly every mile of the nation’s road network, including medians and shoulders, so even a modest right-of-way width added up across millions of miles creates a massive total. Golf courses, while individually large, exist only in thousands of sites, each covering a few hundred acres at most, so their combined area is comparatively small. Home lawns are everywhere too, but each yard is relatively small; add them up over millions of households and you get a very large total, yet still generally less than the expansive road corridors. In this view, roadsides cover the most land, followed by home lawns, with golf courses occupying the least.