These highway signs were found in the northwest part of Illinois along the Mississippi River.

The signs say...

+-------+ +-------+ | IL 84 | | US 20 | +-------+ +-------+ the numbers are: 84 20 the math is: log(sqrt(84 x 20)) = 1.61265 84 x 20 = 1680 sqrt(1680) = 40.9878 log(40.9878) = 1.61265 note: the golden ratio 'phi' = 1.61803399 These signs evaluate to Phi if 1.61265 and Phi are both truncated to the hundreths.These highways signs were submitted to RoadSignMath.com on 11 April 2006. If accepted, their estimated RSM score is as follows.

technical: 6 elegance: 5.94124 / 6 = 0.9902 total: 6 + 0.99 = 6.99

**Creator:** Gerald D. Thurman
[gthurman@gmail.com]

**Created:** 11 April 2006

This work is licensed under a Creative Commons License.