OK if I bought a used car privately from somebody, of course we fill out the bill of sale to authorize transfer of the reg. What's the deal with plates? Obviously the seller will remove his from the vehicle and I won't have any plates until I head over to the registries office to obtain them. What are the rules in this instance, are you allowed a certain amount of time to get them? What happens if a cop stops you? I'll have the insurance slips but can the signed bill of sale be used as a temp registration? Just curious...