In all 50 states, you are required to provide proof of insurance, registration, and a current driver license for the vehicle you are operating.
Just your passport, and your drivers licence (as you will still be operating a motor vehicle on US roadways).
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Legally drunk and subject to a DUI if operating a vehicle on the road. Operating a vehicle at 0.07 or lower can get you a DWI if you have an accident.
Yes. Vehicle registration simply documents who legally owns the vehicle. You don't actually have to have a drivers license to own it.
No, there is no law requiring you to carry your papers/documents/ID card on you unless you are operating a motor vehicle in which case you must present an operators license. In general day to day life operations it is NOT required to carry ID
Yes. If it is legally required, you can be jailed or fined, or held until the vehicle is properly surrendered.
If the vehicle was built with seat belts you have to have them but if it didn't have the belts from the factory your not required to have them.
If you are a US citizen NOWHERE in the US are you required to have identification with you at alltimes.EXCEPT - while operating a motor vehicle, or engaged in occupation or pastime here it is required that you be capable of being identified when challenged by proper authority (e.g.: in the performance of certain occupations - while hunting - while legally carrying a concealed weapon - etc.)
No, once you sign the purchase agreement you are legally bound by that.
vehicle registration and proof of insurance
If you're operating a motor vehicle on any public property, you must be licensed.
Most companies will not allow a minor to purchase an auto policy because they are not a legal adult and an insurance application and policy together make up a legally binding contract. This is also why a vehicle should not be listed as the titled owner of a vehicle. They cannot legally sign documents to purchase or sale a vehicle.