Illinois Golden Ratio

Illinois Golden Ratio
Found by	Gthurman
City
State	Illinois
Country	United States
Continent	North America
Posted on	Apr 15, 2006
Map Location	42° 19' 23" N, 90° 16' 7" W
Numbers	84, 20
Type	Constant
Loading map...

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 northwest corner of