Ever wondered how the highway and interstate numbers came to be? What do they even mean if they mean anything at all? Behind those numbered shields displayed on the signs is a mathematical logic grid ...

At the very inception of the interstate system, officials decided the numbers would not be random. Highways already existed at the time, and they needed a network that would coexist alongside them and ...

It’s my understanding that north and south interstate routes are odd numbered and the ones running east and west are even numbers. Why is Interstate 26, which runs north and south, an even number? Why ...

Add Yahoo as a preferred source to see more of our stories on Google. At the very inception of the interstate system, officials decided the numbers would not be random. Highways already existed at the ...