R.I. Gen. Laws § 31-23-45: Tire treads.

(a) No tire on a vehicle moved on a highway shall have on its periphery less than two thirty-seconds (2/32) of an inch of tread depth. The administrator of the division of motor vehicles is authorized to remove from a highway any vehicle not conforming to this requirement and shall suspend the registration of the motor vehicle until it is made to conform to the requirements of this section.

(b) Violations of this section are subject to fines enumerated in § 31-41.1-4.