BARS::Approaching O'Hare Airport on I-190 West in Chicago, Illinois

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.

```   +------------+ +---------------------+ +---------------------+
| 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