Road Sign Math

David Slauenwhite found this mathematically significant reference marker in New York, near Weedsport.

Mr. Slauenwhite takes some big numbers, and matches them with elegance that is rarely seen with this scale.
34 + 3,071 = 3,105
This is sign is on NY 34 just south of the thruway interchange #40. See sign on map!
Ed.: With this sign [...]

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David Slauenwhite found this sign by the village of Sylvan Beach, northease of Syracuse on Oneida Lake. New York is well-known as the home of the Baseball Hall of Fame in Cooperstown. However, it is also the home of the Soccer Hall of Fame near Oneonta, and Canastota, on this sign, is home to [...]

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Brian Alliet does some quick math on this one.

It is straightforward to get to the “root” of this one.
\sqrt{20 + 5} = 5
This sign is on US20/NY5 westbound just before the western end of the multiplex in Silver Creek, New York. See sign on map!

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Brian Alliet find the mathematical relationship in a whole stack of signs here.

Mr. Alliet plays this sign nicely, using simple addition to show the relationship.
84 + 6 + 17 = 84 + 23
This sign is on US6 eastbound at CR-15 in Port Jarvis, New York. See sign on map!

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Brian Alliet brings this great sunrise shot, accompanied by some math on the right hand side.

The multiples of 30 bode well for a trig solution.
\cos 90^\circ = \sin (5! + 60)^\circ
This sign is on NY5 westbound at the northern terminus of NY60 in Dunkirk, New York. See sign on map!

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Brian Alliet found this mathematically significant sign in New York. Upon submission Mr. Alliet suggested that I may choose not to post this sign. On the contrary, these elegant signs that scream their mathematical relationship are the heart and soul of Road Sign Math. Sure, if you get a slide rule and fire up [...]

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Brian Alliet found this sign combination in Henrietta, New York.

Mr. Alliet showed quick-whits and a good trigonetry background here. Realizing the special relationship in the numbers he concludes.
\sin(390-15)^\circ = \sin 15^\circ
This sign is on NY 252 eastbound at the junction with NY 15A in Henrietta, New York. See sign on map!

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Brian Alliet finds another sign in Avon, New York, just west of Avon Trig.

Mr. Alliet tied the math together nicely here, avoiding any cancelation deductions nicely.
(20-5)\times(20+5) = 390-15
This sign is on NY15 southbound at the junction of NY5 and US-20, just slightly west of Avon Trig in Avon, New York. See sign on map!

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Brian Alliet, a first-timer to Road Sign Math, returns us to New York for this mathematically significant roadsign.

Mr. Alliet uses some elegant trigonometry to show the hidden relationship here.
\sin(390\times5)^\circ = \cos(390\times20)^\circ
This sign is on US20 eastbound at the interchange with I-390 in Avon, New York. See sign on map!

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Afficionado of mathematically significant road signs, David Slauenwhite, picked this sign up while pedaling on two wheels through the Empire State. This sign has the unique characteristic of not being terribly interesting in any way other than the math that it contains. All of the cities are fine, but do not pique ones interest [...]

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