62. No discount may be offered on a fare, except in the cases provided in a rate structure fixed under section 60 or by regulation.
A fare agreed upon with a customer, even if it differs from the rates fixed by the Commission, shall not be regarded as a discount, if the parties enter into a contract in writing, a copy of which is kept in the automobile or at the principal establishment of the holder of a taxi owner’s permit or of a taxi transportation service intermediary’s permit. In addition, the holder must comply with the conditions applicable to the making of such a contract that are prescribed by regulation.