Except as otherwise specified in this section, no one may drive a horse unless:he or she is 18 years old or older; has been issued a driving license by the Commissioner; and has that driving license with him or her while driving the horse. This section does not apply to the rider of a horse that is being held or led, during the entire period of rental or use, by a custodian with a valid driving license. The Commissioner may waive the requirements of this section for individuals participating in:animal shows; organized competitions; special events involving the transportation of people in carriages or sleighs; or similar events. City Code, 1976/83, art. 19, §32(m)(1), (6) Ord. 99-548 Ord. 11-573