Speaking of Quebec, it amazes me how it never runs out of numbers for spur autoroutes (i.e. 930 for 30 around Châteauguay). Here’s my
hypothetical question: if another spur route of A30 is created in Montreal and that it doesn’t go back to A30 on the other end, will it be renumbered A1130? (530, 730 and 930 are all taken.)
I know Quebec follows the Interstate numbering system, and so far I’ve never seen one with 4 digits.