Sorry - looking at my post it could be misleading - to clarify and the concur with navegator - the exemption only applies during the holiday season which this year is defined as Nov 1 to Jan 8 - any other time of year the Hoy no Circula applies to all vehicles as far as I know. Apparently there are ways to get exemptions but there are some strict requirements. During this holiday season those from US and Canada can apply for an exemption but it is limited. Do not get caught driving around DF on the wrong day. They do not excuse ignorance of the law - know before you go.