THE CLIMB (I-40 nr Shamrock TX)
This gasoline price sign on stilts promoted Diesel on top, Regular in the middle, and No Lead on the bottom. Diesel was $1-something when the little Fina station (shown in other images) was abandoned.
Changing prices involved climbing the ladder to all three levels and flipping painted metal tabs that were then latched into place. The attendant also had to get across to the other side, despite the region's nearly-constant wind and four-season climate.