This speed limit sign is on Old Douglas Road in Bisbee, Arizona.

The speed limit sign says...

+----------------+ | School | | Speed Limit 15 | | 7am to 4pm | | School Days | +----------------+the numbers are: 15 7 4 rs42Eval: (sqrt(4! - 15)! * 7 = 42 rs42Eval: summation(sqrt(4), 7) + 15 = 42 * 42 is the "Answer to Life, the Universe, and Everything" * summation(2, 7) = 2+3+4+5+6+7 = 27 rs37Eval: 15 * sqrt(4) + 7 = 37 rs37Eval: summation(4, 7) + 15 = 37 * Whyrs37Eval? 37 Heaven @ http://thirty-seven.org * summation(4, 7) = 4+5+6+7 = 22 rsCardinalityEval: sqrt(15 - (7 - 4)!) = 3 number system rsCardinalityEval: 15_{7}/ 4 = 3 * There are 3 numbers in this speed limit sign. number system rsStateEval: 15_{7}* 4 = 48 * Arizona was the 48th state admitted to the Union. rs420Eval: 4 * 15 * 7 = 420 off-by-one BARSfunc rsAgeEval: spf(15) * 7 * sqrt(4) = 57 + 1 * RoadHacker was 57 years young when he found this speed limit sign. off-by-one rs42Eval: 7 * 4 + 15 = 42 - 1 * 42 is the "Answer to Life, the Universe, and Everything"

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

**Created:** 22 March 2015 (posted 23 March 2015)

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