R.I. Gen. Laws § 31-16-4: Places where U-turns prohibited.

No vehicle shall be turned so as to proceed in the opposite direction upon any curve or upon the approach to, or near the crest of a grade, where the vehicle cannot be seen by the driver of any other vehicle approaching from either direction within five hundred feet (500′). Violations of this section are subject to fines enumerated in § 31-41.1-4.