Salt River Canyon

Gerald Thurman expands on the select few signs on Road Sign Math that are wooden. It's a nice break from the green, metal of the urban landscape to get into the outdoors a bit. This sign guides visitors to Arizona.



This sign is also impressive due to the direct way the math comes around.

$$21 + 16 - 7 - 4 = 26$$

This sign is located in the Salt River Canyone in Arizona.