For anyone travelling to NYS/NYC with moped plans:
Article 48A, Section 2261, Subsection 5:
"5. Out-of-state limited use vehicle registration. The registration
provisions of this article shall not apply to a non-resident who has
registered his limited use vehicle in compliance with the registration
or licensing laws of the state, province or country of his residence,
provided that the limited use vehicle so registered in accordance with
the laws of the state, province or country of residence of such owner is
appropriately identified by an identification plate, sticker or other
identifying device issued by such state, province or country."
You have to carefully check the state's laws to find this. The above info can only be found by actually reading the laws concerning Limited Use Vehicles. The DMV or PD won't tell you the above.