R.I. Gen. Laws § 24-8-6: Authority for sidewalks and curbs.

The director of transportation shall have the power and authority to make, lay in and upon, and construct sidewalks, including curbs, adjacent to and along either or any one side or both sides of any state road, now constructed, in the process of construction, or to be constructed, which in his or her opinion and judgment require sidewalks and curbs for pedestrian travel.