Conn. Gen. Stat. § 14-34: Reciprocity of registration.

(a) A motor vehicle owned by a nonresident and registered for the current year in the state or district of which the owner is a resident may be operated upon the highways of this state without registration under this chapter to the extent, as to period of operation and otherwise, that the state or district of registration grants substantially similar privileges in the case of motor vehicles owned by residents of this state and registered under its laws. The commissioner shall determine whether privileges granted by such states or districts are substantially similar to those granted by this state, which determination shall be final, and may enter into reciprocal agreements with the Commissioner of Motor Vehicles or other like authority of any other state in accordance with which motor vehicles may be operated in this state and such other state. The provisions of this section shall not be construed to limit, amend, repeal or affect any of the powers and jurisdiction of the Department of Transportation or the provisions of sections 14-39, 13b-410a and 13b-410b.

(b) The commissioner shall adopt such regulations in accordance with chapter 54 as he deems necessary to carry out the provisions of subsection (a) of this section.