R.I. Gen. Laws § 31-23-2: Additional parts and accessories.

(a) Nothing contained in this chapter or chapter 24 of this title shall be construed to prohibit the use of additional parts and accessories on any vehicle not inconsistent with the provisions of these chapters.

(b) No person shall install or adjust any equipment, part, or accessory on a motor vehicle that is intended for use on any highway, which would result in the motor vehicle or its operation being inconsistent with the provisions of this chapter or chapter 24 of this title and could result in the issuance of a notice pursuant to § 31-38-2. The penalty for the first violation of the provisions of the subsection shall be a fine of two hundred fifty dollars ($250), for the second violation a fine of five hundred dollars ($500), and for the third and subsequent violations a fine of one thousand dollars ($1,000).