(a) The authority reserves the right from time to time to suspend, modify or revoke the application of any or all of the rules as it deems necessary or desirable.

(b) Any act otherwise prohibited by any of the rules is lawful if specifically authorized by agreement, permit, license, or other writing duly signed by an authorized officer of the authority or the MTA or if performed by an officer, employee or designated agent of the authority or the MTA acting within the scope of their employment or agency.

(c) Rules shall apply with equal force to any person assisting, aiding or abetting another, including a minor, in any of the acts prohibited by the rules or assisting, aiding or abetting another in the avoidance of any of the requirements of the rules.

(d) The order or judgment of a court or other tribunal of competent jurisdiction that any provision of the rules is invalid shall be confined in its operation to the controversy in which is was rendered and shall not affect or invalidate any other provision of the rules or the application of any part of the rules to any other person or circumstances; the provisions of the rules are declared to be severable.

(e) The singular shall mean and include the plural.