We just received a passport request and are waiting for a COPR. Am I correct in understanding that if you have a COPR that you can cross between the US and Canada freely at a land border? My husband works in Detroit and we're looking to live in Windsor, but that would be difficult if we're waiting on a PR card and he can't leave and come back. My understanding is that the issue with the COPR document is that commercial travel (airlines, busses, etc) do not accept it but the land border does?