Road Sign Math

David Slauenwhite found this sign in his historical archive of interesting road signs.

This is a rather basic addition sign laid out nicely from top to bottom. Adding a little spice to the sign is the fact that the first two numbers are both prime numbers. It is always an exciting time when we find multiple prime numbers in our signs, primes are such great numbers.

11 + 13 = 24

This sign was found in Pennsylvania on US 6 heading westbound at PA 155. This sign is located at N41 48 19.7 W78 16 37.3. See sign on map!