I have a neighbor directly across a county road, my address is 3 digits higher than his, but his mailbox was last in line on the same pedestal, so I switched them so his and my mailboxs were sequential. The postmaster went ballistic and said it messed up the entire route. I'm still puzzled by that remark since I have a 4x4 post near my driveway with the correct street address numbers.
When I moved on my property this year I had to apply for and get verification for my 911 address and my driveway permit. I have a 300 foot frontage and actually have 2 gates. One 10 foot and one 16 foot.
There was an old post with no box on it near where the neighbor across the streets was. This was about 100 feet past my second gateway and would have made collecting the mail a PITA.
I had been working on the property for a while and one day I stopped in the post office to talk about changing from a PO box to a mail box at the address and moving the post. The man at the counter said something like, "Seems fine but you should talk to your carrier."
I talked to the carrier about where I want to put the post (basically where I drive past and can collect the mail at will) and she was, "That seems fine to me!"
Around here the carrier's word carries a lot of weight.
Someone mentioned Japan. That system was crazy basically we live at 3-5-12 Meguro. Meguro was the town, 3 was the section, 5 was the block and 12 was the house. But the numbering was "around" the block - so if there were 4 streets making up your block the numbering would be sequential around the block on your side of the street.
We went to a town safety training which was fun and were basically told that if we had an emergency we should fax the fire department a map of our address. Uhh... Yeah. My house is on fire and I'm gonna stop to send a fax - LOL...