[Code 1964, § 17-80]
The Commissioner of Public Safety shall place and maintain traffic control signs, signals and devices when and as required under the traffic ordinances of this City to make effective the provisions of these ordinances, and additional traffic control devices may be placed and maintained as may be deemed necessary to regulate traffic under the traffic ordinances of this City or under state law or to guide or warn traffic.
[Code 1964, § 17-82]
The driver of any vehicle shall obey the instructions of any applicable official traffic control device placed in accordance with the traffic ordinances of this City, unless otherwise directed by a police officer, subject to the exceptions granted the driver of an authorized emergency vehicle in this chapter.
[Code 1964, § 17-83]
(a) 
Authority. The Commissioner of Public Safety may declare any street or part of a street a play street and place appropriate signs or devices in the roadway indicating and helping to protect the play street.
(b) 
Duty of driver. Whenever authorized signs are erected indicating any street or part of a street as a play street, no person shall drive a vehicle upon any play street or portion of the street except a driver of a vehicle having business or whose residence is within the closed area, and then any driver shall exercise the greatest care in driving upon any play street or portion of the play street.
[Code 1964, § 17-84]
The Commissioner of Public Safety may:
(1) 
Designate and maintain, by appropriate devices, marks or lines upon the surface of the roadway, crosswalks at intersections where, in the Commissioner's opinion, there is particular danger to pedestrians crossing the roadway and at such other places as the Commissioner may deem necessary for the protection of pedestrians.
(2) 
Establish safety zones of such kind and character and at such places as the Commissioner may deem necessary for the protection of pedestrians.
(3) 
Mark lanes for traffic on street pavements at such places as the Commissioner may deem necessary and advisable, consistent with the traffic ordinances of this City.
[Code 1964, § 17-85]
Speed limit signs shall be posted on every main highway entering the City and also on every main highway within the limits of the City where the rate of speed changes.
[Code 1964, § 17-86(a)]
The Commissioner of Public Safety may, after engineering and traffic investigations, remove existing stop signs and replace these stop signs, designating the safe rate of speed for vehicles approaching and crossing intersections. Any stop sign removed as authorized by this section shall be replaced within a sixty-day period unless an ordinance is adopted ordering the removal of the stop sign.
[Code 1964, § 17-87]
The Commissioner of Public Safety may place markers, buttons or signs within or adjacent to intersections indicating the course to be traveled by vehicles turning at these intersections, and the course to be traveled as so indicated may conform to or be other than prescribed by law or ordinance.
[Code 1964, § 17-89]
Whenever any ordinance of this City designates any one-way street or alley, the Commissioner of Public Safety shall place and maintain signs giving notice of the one-way street or alley, and no ordinance shall be effective unless the signs are in place. Signs indicating the direction of lawful traffic movement shall be placed at every intersection where movement of traffic in the opposite direction is prohibited.
[Code 1964, § 17-90]
Every stop sign erected shall bear the word "stop" in letters not less than six inches in height, and the stop sign shall at nighttime be rendered luminous by steady or flashing internal illumination or by a fixed floodlight projected on the face of the sign or by efficient reflecting elements on the face of the sign. Every stop sign shall be located as near as practicable at the nearest line of the crosswalk on the near side of the intersection or, if none, at the nearest line of the roadway.
[Code 1964, § 17-91]
Whenever any ordinance of this City designates and describes a through street, the Commissioner of Public Safety shall place and maintain a stop sign on each and every street intersecting the through street or intersecting that portion of the through street described and designated as such by any ordinance of this City. Those streets and parts of streets described in Section 2-16-357 are declared to be through streets.
[Code 1964, § 17-92]
Where any ordinance of the City designates and describes an intersection where a particular hazard exists upon other than through streets, the Commissioner of Public Safety shall place and maintain a stop sign at one or more entrances to any hazardous intersection as described and designated by any ordinance of the City. Those intersections described in Section 2-16-358 are declared and designated as stop intersections.
[Code 1964, § 17-93]
(a) 
The Commissioner of Public Works may designate certain City streets or portions of streets as restricted highways and shall post the street or portion of the street with a notice designating the type of vehicular traffic or maximum gross vehicle weight that is prohibited.
(b) 
If use of the posted street or portion of the street is desired by any person which would be in violation of the restricted highway designation, a permit by the person may be obtained from the Commissioner of Public Works upon the person's executing and filing sufficient security with the Commissioner for repairs of any damage to the restricted street or portion of the street caused by the prohibited use.
[Code 1964, § 17-152(a)]
The Commissioner of Public Safety may erect signs indicating no parking upon that side of any street adjacent to any school property when the parking would, in the Commissioner's opinion, interfere with traffic or create a hazardous situation.
[Code 1964, § 17-153(a)]
The Commissioner of Public Safety may erect signs indicating no parking upon any street when the width of the roadway does not exceed 20 feet or upon one side of a street, as indicated by no-parking signs, when the width of the roadway does not exceed 30 feet.