A. 
The traffic engineer shall have the power and duty to place and maintain, or cause to be placed and maintained, official traffic-control devices when and as required under this title to make effective the provisions of said chapters.
B. 
Whenever the Vehicle Code of the state requires, for the effectiveness of any provision thereof, that traffic-control devices be installed to give notice to the public of the application of such law, the traffic engineer is hereby authorized to install or cause to be installed the necessary devices, subject to any limitations or restrictions set forth in the law applicable thereto.
C. 
The traffic engineer may also place and maintain, or cause to be placed and maintained, such additional traffic-control devices as he/she may deem necessary to regulate traffic or to guide or warn traffic, but he/she shall make such determination only upon the basis of traffic engineering principles and traffic investigations, and in accordance with such standards, limitations and rules as may be set forth in this chapter or as may be determined by other ordinance or resolution of the legislative body of this City.
(1960 code § 13.26; Ord. 1787 § 1, 2006; Ord. 2065 § 1(A), 2018)
No provision of the Vehicle Code of the state or of this title for which signs are required shall be enforced against an alleged violator unless appropriate signs are in place and sufficiently legible to be seen by an ordinarily observant person, giving notice of such provisions of the traffic laws.
(1960 code § 13.27; Ord. 1787 § 1, 2006)
The traffic engineer shall determine the hours and days during which any traffic-control device shall be in operation or be in effect, except in those cases where such hours or days are specified in this title.
(1960 code § 13.33; Ord. 1787 § 1, 2006)
The driver of any vehicle shall obey the instructions of any official traffic-control device applicable thereto placed in accordance with the provisions of this chapter, unless otherwise directed by a police officer, subject to the exceptions granted the driver of an authorized emergency vehicle when responding to emergency calls.
(1960 code § 13.28; Ord. 1787 § 1, 2006)
The traffic engineer is authorized to mark centerlines and lane lines upon the surface of the roadway to indicate the course to be traveled by vehicles, and may place signs temporarily designating lanes to be used by traffic moving in a particular direction, regardless of the centerline of the highway.
(1960 code § 13.30; Ord. 1787 § 1, 2006)
The traffic engineer is authorized to place and maintain distinctive roadway markings, as described in the Vehicle Code of the state, on those streets or parts of streets where the volume of traffic or the vertical or other curvature of the roadway renders it hazardous to drive on the left side of such marking or signs and markings. Such marking, or signs and markings, shall have the same effect as similar markings placed by the State Department of Public Works pursuant to provisions of the Vehicle Code of the state.
(1960 code § 13.31; Ord. 1787 § 1, 2006)
Whenever any provision of this code or other ordinance or resolution of the City designates any one-way street or alley, the traffic engineer shall place and maintain signs giving notice thereof, and no such regulations shall be effective unless such signs are in place. Signs indicating the direction of lawful movement shall be placed at every intersection where movement of traffic in the opposite direction is prohibited.
(1960 code § 13.40; Ord. 1787 § 1, 2006; Ord. 2065 § 1(A), 2018)