(a) The police chief, by and with the approval of the city engineer, may make regulations necessary to make effective the provisions of this chapter and make and enforce temporary regulations to cover emergencies or special conditions.
(b) The city engineer may make temporary rules regulating traffic or test traffic control devices under actual conditions of traffic. No experimental rule regulating traffic shall remain in effect for more than 90 days.
(1957 Rev. Ords., § 13.109; 1992 Code, § 40-11)