R.I. Gen. Laws § 31-25-9: Prevention of leakage of load.

No vehicles shall be driven or moved on any highway unless the vehicle is so constructed or loaded as to prevent any of its load from dropping, sifting, leaking, or otherwise escaping from it. However, sand may be dropped for the purpose of securing traction, or water or another substance may be sprinkled on a roadway in cleaning or maintaining the roadway. Violations of this section are subject to fines enumerated in § 31-41.1-4.