Yellow shall mean no stopping, standing or parking at any time between seven a.m. and six p.m. of any day except Sundays and holidays, for any purpose other than the loading or unloading of passengers or materials; provided, that the loading or unloading of passengers shall not consume more than three minutes nor the loading or unloading of materials more than twenty minutes. (Ord. 899 NCS § 1; Ord. 858 NCS § 1; prior code §15.12.l(2).)