A parking attendant may detain or immobilize a motor vehicle or trailer with the use of equipment approved by the Parking Authority if —
(a) a notice of violation with warning has been issued in respect of the motor vehicle or trailer under section 145;
(b) the 30 minutes allotted under section 145 to remove the motor vehicle or trailer has expired; and
(c) the motor vehicle or trailer remains in violation of the parking restriction.