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 first glance, the U.S. Interstate Highway system might seem like a logical grid-based masterpiece with a semblance of order behind its numbering system. Odd-numbered interstates run from north to ...

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 ...