Thanks for this. . . I've been writing lots of GOTV letters across the country and paying attention to the addresses, rather than simply writing them on the envelopes, help make the process interesting.
I spent 20+ years in Washington, DC so am used to NW, NE, SW, and SE with avenues, numbered streets, flower streets of two syllables, blah blah blah. But I now live in rural Virginia and state routes are the norm.
Your explanation got me to focus more on what and why. And, I learned something, so thank you.