Originally Posted by
Katja
No, you do not need any documentation.
That said, I pretty much take my placard with me everywhere I travel. In the domestic US, placards from other states are honored (almost) everywhere. Internationally, a placard can be used in a pinch for parking (not necessarily legal, but usually honored) or as a proof of disability in countries where the disabled are expected to have such proof.
Agreed. My parking placard from Canada is honored without question in the US. I also have a wallet size card (it comes with the placard) that I carry as well.