No person shall drive any car, cycle, or other vehicle, or ride or lead any horse, in any portion of a park except upon the established drives or roadways therein or such other places as may be officially designated by the City. All vehicular traffic on Park Circle shall be one way, in an easterly direction, and no vehicle shall be driven contrary to one-way traffic signs. No person shall drive a truck or other commercial vehicle of any kind along or over any park roads or drives, except for delivery of its load for use in such park.