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We are Germans traveling to Toronto but want to visit friends in the US as well. We plan to pick up a rental car at Toronto airport (and return it there). I don't find any car rental service that explicitly "allows" crossing borders but some say it is not allowed and some may hide it deeper in their terms and conditions.
Does anybody know...
rental agencies that explicitly allow this?
what happens if I cross the border violating their terms?
why they might have problems allowing this? I mean we're not going to Mexico ;)