My AAA magazine came today and had a brief article about travel documents. They referenced a web site that has some helpful information - www.http://getyouhome.gov/ . Mentions that for travel by land you can also use an Enhanced Drivers License , but the site says the only states issuing those are NY and WA with AZ, VT and MI coming soon. (EDLs have an RFID chip in them which transmit a number to the border people and pulls you up on their screen.) Before I tried to use an EDL I would be sure it worked! Hate to be stuck in Canada, eh?