We find math along the roadside as we head out of Yellowstone National Park. Randy Weiss snagged this winner from Wyoming after communing with the bears.

Another great addition sign. Bonus points for every digit in this sign being an even number!

This sign is found on eastbound US 14, 16 and 20 which all share this one ribbon of blacktop in Wyoming heading out of Yellowstone National Park. The GPS coordinates are approximately N44 28 20.0 W109 53 00.2. See sign on map!

After a very long spell of signs from the northeastern states we finally return to the heartland of America, where one could argue the hunt for mathematically significant roadsigns may be harder as is life in general, with this first sign from Wyoming. This is also the first white informational sign to show it’s mathematical connections. During the summer this sign lies dormant, but in winter when large amounts of snow dump into the Black Hills this sign plays a crucial role, protecting drivers as they voyage into the higher elevations. Randy Weiss brings this sign to us from an amazingly long road trip.

I haven’t done the analysis, but I suspect that the square root function is the most commonly used function in roadsigns. Here the square is very identifiable.

\sqrt {16} = 4

This sign is found just as you leave Newcastle, WY and head into the Black Hills. The GPS coordinates are approximately N43 50 56.0 W104 11 02.1. See sign on map!