N.Y.C. Admin. Code § 20-381.2: § 20-381.2 Lighting and safety equipment for horse drawn cabs.

a. The commissioner shall promulgate rules requiring that sufficient lighting and reflective materials be provided on horse drawn cabs including sufficient lighting on the rear axle of all horse drawn cabs at the location where licenses are affixed. Such rules shall be enforced in the same manner as the enforcement of rules promulgated pursuant to section 20-384 of the code.

b. Every horse drawn cab licensed pursuant to this subchapter of the code must be equipped with an emergency brake system, unaffected by rain or wet street conditions.