§ 218. Special classification of vehicles. Notwithstanding any other
provision of this chapter, any vehicle or class of vehicles may, by
regulation of the commissioner, be added to or exempted from any of the
definitions or classifications contained in this chapter, where such
addition or exemption is deemed, in his discretion, either necessary,
desirable or equitable because of the particular characteristics of such
vehicle or class of vehicles; provided, however, that no vehicle which
is exempted from registration by any provision of this chapter may be
reclassified pursuant to this section to require registration, and no
vehicle which is specifically enumerated in schedule F of subdivision
seven of section four hundred one of this chapter may be reclassified
pursuant to this section to require registration at an increased fee.