Road Sign Math

H.B. Elkins found this sign while driving through Illinois.

Mr. Elkins takes a 25% score penalty for the use of multiplicative identity, but it’s still more points on the board.
45 \times 1 = 45
This sign is found at the intersection of Illinois highway 1 with US-45. See sign on map!

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Road Sign Math beginner Ben Coates sends in only the second sign from the great state of Illinois.

Mr. Coates barely got this picture off in time to get it submitted to our site.
(237 - 235) + (74 - 72) - 1 = 3
This sign is found while heading north on I-57 in Illinois. See sign [...]

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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 [...]

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