### BARS::AZ Hwy-80 Underpass With Speed Limit Signs in Bisbee, Arizona

These highway signs are in Bisbee, Arizona. MathBabbler took this picture while staying in Bisbee for Pi Day 2011.

The highway signs say...

```   +------------+ +--------------+ +------------+
| AZ 80 West | | 16 FT - 6 IN | | AZ 80 East |
| Old Bisbee | +--------------+ |   Douglas  |
+------------+                  +------------+
+-------+                            +-------+
| Speed |                            | Speed |
| Limit |                            | Limit |
|   25  |                            |   25  |
+-------+                            +-------+

```
```   the numbers are:  80  16  6  80  25  25

the math is:  80 / (80 / 16) - 6 - sqrt(25) = sqrt(25)

more math:  80 / sqrt(25) * sqrt(80 / sqrt(25)) = (sqrt(sqrt(16))^6

more math:  6 - 80 / 80 - 25 / 25 = sqrt(16)

more math:  16^(80 - 80) = 6^(25 - 25)

rsPhiEval:  ((80/80 + sqrt(25 / sqrt(25))) / (6 - sqrt(16)) = Phi
* Phi is the golden ratio and it approximates 1.61803399