Randy Weiss found this truly fascinating sign at the entrance of Dinosaur National Monument in Utah. Up to this point the math in our signs has been composed of mainly units in miles or road numbers, with an occasional exit number added for fun. This sign will have none of that. Instead, this sign brings dollars, years and days into it’s mathematical beauty! Randy captured this picture under close scrutiny from the park ranger, and recommends the Dinosaur Park to anyone that passes through the area — not just for this sign either!

With all the numbers being divisible by 5, it looks at first glance that this sign has a mathematical connection. With a second glance the 62 pops out, a burn job for sure. Then the third glance reveals the 7. After that, it all clicks together.

This sign is found on the right side of the road as you approach the ranger station to pay your fee. The GPS coordinates are approximately N40 26 16.7 W109 18 31.3. See sign on map!

Just south of Flaming Gorge National Recreation Area (really, that’s what it’s called!), in the Ashley National Forest, comes a small and humble tribute to mathematically significant roadsigns. It’s unclear what the orange trail marker on the sign is designating. Randy Weiss brings us this Utah sign.

There is only so much you can say about square roots. They seem to have overtaken Road Sign Math! One would have never guessed how many square root signs there are out there. They are perfectly valid winners, nevermind their popularity.

This sign is found just off the road on US-191 heading south in Utah. The GPS coordinates are approximately N40 46 52.3 W109 28 13.7. See sign on map!

Randy Weiss found this mathematically significant roadsign in Utah. While descending the mountains via a number of switchbacks he started seeing a pattern. Each switchback had a different speed limit depending on the radius of the turn and the pitch of the highway at that point, and they announce how many more switchbacks to come before you reach the plain at the bottom. With impeccable planning, the switchback 5 from the bottom was given the speed limit of 25 MPH.

The math here is obvious to anybody learning square roots in grade school.

\sqrt{25} = 5

This sign is found on US-191 heading south to Vernal, Utah through some hairy switchbacks. The GPS coordinates are approximately N40 37 56.2 W109 28 37.9. See sign on map!

Ed.: With this sign submission Randy Weiss has tied David Slauenwhite with five first in state signs each. Randy has introduced Montana, Rhode Island, South Dakota, Wyoming and now Utah. David has introduced Alaska, Connecticut, Massachusettes, New York and Pennsylvania. Gentlemen, congratulations to you both!