Road Sign Math

Jamie Thingelstad puts another mathematically significant roadsign up for the great state of Minnesota.

The math reveals itself without much effort.
\sqrt{5-1}=2
This sign is found in the first couple of miles after you’ve entereed Minnesota heading north on I-35. See sign on map!

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Jamie Thingelstad found this sign in the birthplace of Road Sign Math, Minnesota. Just outside of the great bicycling and recreation destination of Lanesboro this wonderful sign was placed for the mathematically curious.

The math on this sign could knock you over with it’s simplicity.
4 + 14 = 18
This sign is found on outside of [...]

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Here is the third submission from Jim Bernard Jr., an early RSM enthusiast. The math isn’t going to win any awards, but it qualifies as a winning sign and as of the submission date there doesn’t seem to be anything controversial about it (unlike a recent sign submitted by his father).
The sign offers [...]

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Dave Oosterhuis discovers the wonder of parking signs and the mathematical relationships found in them.

Mr. Oosterhuis explored a number of solutions for this sign and finally settled on this one.
\sqrt{9} - \sqrt{4} = 7 - 6
This sign is found on Lyndale Avenue, between 38th and 39th street south in Minneapolis, Minnesota. The GPS coordinates [...]

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Dave Oosterhuis brings another mathematically significant roadsign from Minnesota. This sign is right in the backyard of the founder of Road Sign Math, who is ashamed to realize that he never recognized this one.

Very nice math in this sign. The 18 goes into the 36 wonderfully.
{36 \over 18} = \sqrt{4}
This sign is on I-35W [...]

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This sign is submitted by Road Sign Math first-timer, and brother-in-law of the founder of the hunt for mathematically significant roadsigns, Dennis Daily. This sign is a hidden tribute to Rolling Rock beer, and it’s references to “33″ on their bottles. Rolling Rock puts this 33 on their bottles as a tribute to the [...]

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Dave Oosterhuis and his wife Phoebe captured this sign on a recent trip to Iowa City for homecoming. Dave would like to express excitement for the event with a splendid “Go Hawks“. It excites me greatly though that another couple are sharing in the enjoyment of hunting mathematicaly signficant roadsigns. As the old [...]

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Rosalin Chrest found her 2nd 3rd winning sign returning to the Twin Cities on a road trip with her son, the founder of Road Sign Math, and family. Kudos to her for spotting this sign before her son got it. This sign presents it’s numbers in a way that would make Joe Friday happy. There [...]

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The section of I-94 from Minneapolis, MN to Fargo, ND is perhaps one of the most thoroughly scoured segments of highway in the search for mathematically significant signs, but it continues to produce. Just 67 miles down I-94 from Genesis, this great winner was found.

This winner hides it’s relationship pretty well. The math is [...]

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Long before the game of finding mathematically significant road signs, this sign used to always catch my eye. Black Dog Road. It sounds like a place where some mystery happened years ago. If you were sitting around a campfire with your grandpa you could easily envision him whipping out a story about the Ghost [...]

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