R.I. Gen. Laws § 39-14-26: Revocation or amendment of certificate.

Any taxi or limited public motor vehicle certificate holder who, during any period of not less than one hundred eighty (180) consecutive days, has failed to render any part of the service authorized by his or her certificate, except for reasonable cause, including bankruptcy, receivership, or other trustee proceedings, shall be deemed to have abandoned that part of the service; and if, after a hearing, the administrator finds the certificate holder has failed to render service in accordance with the certificate, his or her rights thereto to the extent of his or her failure to render service shall be revoked. The administrator may, for sufficient cause shown after a public hearing, amend, suspend, or revoke any certificate issued under this chapter.