Conn. Gen. Stat. § 14-25c

The Commissioner of Motor Vehicles shall issue distinctive registration marker plates to each motor vehicle, except a taxicab or motor vehicle in livery service, that is used as a student transportation vehicle, as defined in section 14-212 . Each such registration of a student transportation vehicle shall be issued for a period of one year and, subject to the provisions of subsection (d) of section 14-103 , may be renewed by the owner, in accordance with schedules established by the commissioner. The fee for such registration or for any renewal thereof shall be determined as follows: (1) In the case of any such motor vehicle designed as a service bus, the fee shall be one-half of the fee prescribed for the registration of a service bus, in accordance with the provisions of subsection (p) of section 14-49 , and (2) in the case of any such motor vehicle designed as a passenger motor vehicle, the fee shall be one-half of the fee prescribed for the biennial combination registration of a passenger motor vehicle or one-third of the fee prescribed for the triennial combination registration of a passenger motor vehicle, in accordance with the provisions of subdivision (1) of subsection (e) of section 14-49 .