No person shall park a vehicle within an alley, except for the purpose of loading and unloading merchandise and then in such a manner or under such conditions as to leave available less than ten feet of the width of the roadway for the free movement of vehicular traffic, and no person shall stop, stand or park a vehicle within an alley in such a position as to block the driveway entrance to any abutting property.
Penalty, see § 72.99