These road signs are on westbound I-190 in Chicago, Illinois.

[Disclaimer] The picture of these road signs belongs to Interstate-Guide.com (i.e. the picture was not taken by RoadHacker, nor is it the property of MathBabbler). RoadHacker has driven under these road signs multiple times with the most recent encounter occuring during mid-May of 2008.

The road signs say...

+------------+ +---------------------+ +---------------------+ | I-190 West | | Exit 2B | | Exit 2A | | O'Hare | | US-12 US-45 South | | US-12 US-45 North | | Ahead | | Mannheim Rd | | Mannheim Rd | +------------+ | 1/4 Mile | +---------------------+ +---------------------+the numbers are: 190 2 12 45 1/4 2 12 45 the math is: (190 - 45 - 45) * 1/4 - 2 / 2 - 12 = 12 observe... 190 - 45 - 45 = 100 100 * 1/4 = 25 2 / 2 = 1 25 - 1 = 24 24 - 12 = 12 more math: sqrt(190 - 45 - 45) / sqrt(1/4) = 12 + 12 - 2 - 2 observe... sqrt(100) = 10 sqrt(1/4) = 1/2 10 / 1/2 = 20 more math: sqrt(1/4 * ((45 - sqrt(190 - (45 - 12 - 12))) / 2)) = 2 observe... 45 - 12 - 12 = 21 190 - 21 = 169 sqrt(169) = 13 45 - 13 = 32 32 / 2 = 16 16 * 1/4 = 4 sqrt(4) = 2

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

**Created:** 17 May 2008

This work is licensed under a Creative Commons Attribution 3.0 United States License.