Road Sign Math

It has been 185 signs since we were in Kentucky, and thanks to H.B. Elkins we have returned.

Mr. Elkins daftly identified the root of this sign.
1 + 7 = \sqrt{64}
This sign is in Grayson, Kentucky at the intersection of KY-1/KY-7 and KY-9. See sign on map!

[Read more →]

H.B. Elkins found this mathematical road sign in the eastern panhandle of West Virginia.

Mr. Elkins identifies a very elegant solution bringing all five numbers together.
(16-14) + 2 = 13 - 9
This sign is on I-81 northbound at Martinsburg, West Virginia. See sign on map!

[Read more →]

H.B. Elkins found this mathematically significant road sign in rural West Virginia between the towns of Hinton and Alderson.

Mr. Elkins pulls some factorials to make this work.
3! + 3! = 12
This sign is in West Virginia. See sign on map!

[Read more →]

Effective immediately the judging committee of Road Sign Math has authorized two substantive changes to the game. We expect that these rule changes may be controversial, however, we are resolute in the changes.
The first change is a new math rule, E1, that has removed trigonometry functions from the game as well as logarithm and [...]

[Read more →]

Frank Kaszar may be the first person to be suffering from Road Sign Math addiction. For this post, his submission is being included verbatim.

Dear Administrator,
I am terribly pleased to finally be submitting this sign. I noticed it in February and was fascinated by the numbers involved. There were a lot of them, but they [...]

[Read more →]

Gerald Thurman accomplishes a first ever in Road Sign Math! He has found a pi sign, and by inserting himself into the picture he put the entire solution right there. Mr. Thurman found this sign on Pi Day (March, 14th) 2006.

While a bit pedestrian, we still get excited about the most commonly used pi solution [...]

[Read more →]

Randy Weiss continued a mile down the road after finding Watch Your Head and is able to find another mathematically significant road sign.

Mr. Weiss breaks from the most traditional way of achieving pi on Road Sign Math with a new approach! Apparently this strategy was suggested to him from his brother.
\sqrt{2} + \sqrt{13-10} \approx [...]

[Read more →]

Randy Weiss puts another sign on the map for Connecticut.

The math here is the kind we most appreciate, simple addition.
10 + 3 = 13
This sign is on northbound I-95 in Clinton, Connecticut. See sign on map!

[Read more →]

Gerald Thurman shows us a sign leading to a big house.

Mr. Thurman neatly uses a factorial to bring this one home.
(10 - 6)! = 24
This sign is on prime-numbers highway 587 near it’s juncture with highway 87 just south of Chandler, Arizona. See sign on map!

[Read more →]

Gerald Thurman felt this sign was a stretch, but it’s a sure winner containing Fibonacci’s golden rato. This sign also brings Illinois to Road Sign Math, joining the slew of other states that have embraced mathematically significant roadsigns.

Mr. Thurman applies slide-rule-like-deftness to get this winner.
\log{\sqrt{85 \times 20}} \approx 1.61265 \approx \varphi
This sign is in the [...]

[Read more →]