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.

This sign is found at the intersection of Illinois highway 1 with US-45. See sign on map!

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.

This sign is found while heading north on I-57 in Illinois. See sign on 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 Illinois, at the junction of highway 84 and US-20. See sign on map!

Ed.: With this sign, Illinois becomes the 35th state to be found on Road Sign Math. There are only 15 opportunities to get a Gold Star remaining in the game! There can only be one person with the first gold star from Arkansas, Idaho, Indiana, Kansas, Louisiana, Maine, Michigan, Mississippi, Missouri, Nevada, Oklahama, South Carolina, Tennessee, Texas and Washington. Let’s get these hold outs!