R.I. Gen. Laws § 31-45-5: Motor vehicle radios, stereos and audio systems.

It shall be unlawful for any motor vehicle with a radio, stereo or audio system to produce sound which exceeds those limits specified in this chapter. Police cars, ambulances and fire engines shall not be subject to this section. Local cities and towns may, at their discretion, issue temporary exemption by special permit upon a showing of good cause. Violations of this section are subject to fines enumerated in § 31-41.1-4.