Conn. Gen. Stat. § 14-24
The Commissioner of Motor Vehicles may, if in the commissioner's opinion it is equitable, grant a special registration and furnish a special set of number plates or markers, limited or unlimited as the commissioner deems advisable, for the operation of heavy duty trailers for the transportation of heavy construction equipment, of cranes or other heavy construction equipment upon the streets and highways of this state from the railroad station or the storage yard to the construction job, or from one construction job to another. Each movement of such trailer, when loaded, crane or other heavy construction equipment shall require a limited or unlimited written permit from the Commissioner of Transportation, unless it is operating with an annual permit and a confirmation number furnished by said commissioner pursuant to section 14-270. The Commissioner of Transportation shall issue for each such vehicle operating with such an annual permit a document which identifies the vehicle and states the date of issue and date of expiration. The original document, as furnished by the Commissioner of Transportation, shall be carried in the vehicle. The markers or number plates furnished by the Commissioner of Motor Vehicles shall be displayed in a prominent place on the rear of the vehicle. Such registration may be revoked or suspended at the discretion of the commissioner. Nothing in this section shall be construed to prevent the commissioner from issuing temporary registrations for vehicles of this class. The commissioner may, upon receipt of a certified copy of a permit granted under the provisions of section 13a-117, grant to the person named in the permit a special registration and furnish a special set of number plates or markers, limited or unlimited, as specified in the permit, which permit shall be a part of such registration. The registered gross weight of any tractor-trailer unit, where the trailer is registered as a heavy duty trailer, shall be the light weight of the tractor plus the gross weight of the heavy duty trailer.
Conn. Gen. Stat. § 14-24
(1949 Rev., S. 2369; 1969, P.A. 768, S. 137; 1971, P.A. 355, S. 3; P.A. 73-98; P.A. 95-325, S. 4, 16; P.A. 17-230, S. 7.)