R.I. Gen. Laws § 31-15-5: Overtaking on the right.

(a) The driver of a vehicle may overtake and pass upon the right of another vehicle only under the following conditions:

(1) When the vehicle overtaken is making or about to make a left turn;

(2) Upon a one-way street, or upon any roadway on which traffic is restricted to one direction of movement, where the roadway is free from obstructions and of sufficient width for two (2) or more lines of moving vehicles. Violations of this section are subject to fines enumerated in § 31-41.1-4.

(b) The driver of a vehicle may overtake and pass another vehicle upon the right only under conditions permitting the movement in safety. In no event shall the movement be made by driving off the pavement or main-traveled portion of the roadway.