No street shall be closed or detours established without approval of the city traffic engineer.
Barriers and signs shall be erected as directed by the city traffic engineer and shall be a type approved by the city traffic engineer.
The driver of any vehicle shall obey the instructions of any barricades or devices placed under the provisions of this section.
When responding to an emergency, public utility vehicles and city vehicles shall be exempt from the provisions of this section. (Prior code § 25.01.011)