"Inexpensive" is really an understatement when talking about replacing the entire, worldwide sign and lane marker infrastructure (nb with something that's order

"Inexpensive" is really an understatement when talking about replacing the entire, worldwide sign and lane marker infrastructure (nb with something that's orders of magnitude more issue-prone than current solution). Who pays for that? What if a state/country says "we don't care about your active signs, WONTFIX"? Worse, "can't see stop sign" is currently easy to spot and debug; in your proposal, this would require retooling the world over.