R.I. Gen. Laws § 31-47.2-4: Periodic inspection.

(a) Beginning no later than January 1, 2003, all vehicles subject to the provisions of this chapter and registered in Rhode Island shall be inspected for emissions on a periodic basis.

(b) Vehicles subject to the provisions of this chapter which are operated in fleets of ten (10) or more vehicles may be self-inspected or inspected at a heavy-duty authorized inspection and repair (HD-AIRS) facility on an annual basis.

(c) Individual heavy-duty vehicle owners, not in a fleet of ten (10) or more vehicles, shall have their vehicles inspected at a heavy-duty authorized inspection and repair (HD-AIRS) facility on an annual basis.