§ 321. Exceptions. 1. This article shall not apply to any motor
vehicle for the operation of which security is required to be furnished
under section three hundred seventy of this chapter, including those for
which a certificate is issued pursuant to section three hundred
seventy-one of this chapter or under a similar law in another state
except as may be provided in section three hundred seventy; to any motor
vehicle operated under a permit or a certificate of convenience and
necessity issued pursuant to the transportation law, or under a permit
or certificate issued by the public utility regulatory agency of another
state; nor to any vehicle for which a permit or certificate is in force
pursuant to the interstate commerce act nor to any motor vehicle owned
by the United States, any state or any political subdivisions of any
state.

2. Provided, however, that any motor vehicle exempted in subdivision
one of this section from the provisions of any portion of this article
shall be subject to the provisions of article fifty-one of the insurance
law.