[Code 1964, § 17-39]
The board of aldermen shall by resolution determine and designate the character or type of all official traffic signs and signals. Subject to such determination and designation, the police department is hereby authorized, and as to those signs and signals required under this chapter it shall be its duty, to have placed and maintained or cause to be placed and maintained all official traffic signs and signals. All signs and signals required under this chapter for a particular purpose shall so far as practicable be uniform as to location throughout the city. No provisions of this chapter for which signs are required shall be enforced against an alleged violator if, at the time and place of the alleged violation, the sign herein required is not in proper position and sufficiently legible to be seen by an ordinarily observant person. Whenever a particular section herein does not state signs are required, such section shall be effective without signs being erected to give notice thereof.
[1]
State law references—Similar provisions, RSMo. §§ 300.130, 300.145.
[Code 1964, § 17-39.1]
(a) 
Whenever traffic is controlled by traffic-control signals exhibiting different colored lights, or colored lighted arrows, successively one (1) at a time or in combination, only the colors green, red and yellow shall be used, except for special pedestrian signals carrying a word legend, and such lights shall indicate and apply to drivers of vehicles and pedestrians as follows:
(1) 
Green indication.
a. 
Vehicular traffic facing a circular green signal may proceed straight through or turn right or left unless a sign at such place prohibits either such turn. But vehicular traffic, including vehicles turning right or left, shall yield the right-of-way to other vehicles and to pedestrians lawfully within the intersection or an adjacent crosswalk at the time such signal is exhibited;
b. 
Vehicular traffic facing a green arrow signal, shown alone or in combination with another indication, may cautiously enter the intersection only to make the movement indicated by such arrow, or such other movement as is permitted by other indications shown at the same time. Such vehicular traffic shall yield the right-of-way to pedestrians lawfully within an adjacent crosswalk and to other traffic lawfully using the intersection;
c. 
Unless otherwise directed by a pedestrian control signal as provided in RSMo. section 300.160, pedestrians facing any green signal, except when the sole green signal is a turn arrow, may proceed across the roadway within any marked or unmarked crosswalk.
(2) 
Steady yellow indication.
a. 
Vehicular traffic facing a steady yellow signal is thereby warned that the related green movement is being terminated or that a red indication will be exhibited immediately thereafter when vehicular traffic shall not enter the intersection;
b. 
Pedestrians facing a steady yellow signal, unless otherwise directed by a pedestrian control signal as provided in Revised Statutes of Missouri, section 300.160, are thereby advised that there is insufficient time to cross the roadway before a red indication is shown and no pedestrian shall then start to cross the roadway.
(3) 
Steady red indication.
a. 
Vehicular traffic facing a steady red signal alone shall stop before entering the crosswalk on the near side of the intersection or, if none, then before entering the intersection and shall remain standing until a green indication is shown except as provided in paragraph b of this subparagraph;
b. 
The driver of a vehicle which is stopped as close as practicable at the entrance to the crosswalk on the near side of the intersection or, if none, then at the entrance to the intersection in obedience to a red signal, may cautiously enter the intersection to make a right turn but shall yield the right-of-way to pedestrians and other traffic proceeding as directed by the signal at the intersection, except that the state highway commission with reference to an intersection involving a state highway, and the city, with reference to an intersection involving other highways under its jurisdiction, may prohibit any such right turn against a red signal at any intersection where safety conditions so require. Such prohibition shall be effective when a sign is erected at such intersection giving notice thereof;
c. 
Unless otherwise directed by a pedestrian control signal as provided in Revised Statutes of Missouri, section 300.160, pedestrians facing a steady red signal alone shall not enter the roadway.
(b) 
In the event an official traffic-control signal is erected and maintained at a place other than an intersection, the provisions of this section shall be applicable except as to those provisions which by their nature can have no application. Any stop required shall be made to a sign or marking on the pavement indicating where the stop shall be made, but in the absence of any such sign or marking the stop shall be made at the signal.
[1]
State law reference — Similar provisions, RSMo. § 300.155.
[Code 1964, § 17-40]
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 traffic or police officer, subject to the exceptions granted the driver of an authorized emergency vehicle in this chapter.
[1]
State law reference — Similar provisions, RSMo. § 300.140.
[Code 1964, § 17-41]
(a) 
No person shall place, maintain or display upon or in view of any highway an unauthorized sign, signal, marking or device which purports to be or is an imitation of or resembles an official traffic control device or railroad sign or signal, or which attempts to direct, the movement of traffic, or which hides from view or interferes with the effectiveness of any official traffic control device or any railroad sign or signal.
(b) 
Every such prohibited sign, signal or device is hereby declared to be a public nuisance, and the police department is hereby empowered to remove the same or cause the same to be removed without notice.
[1]
State law reference — Similar provisions, RSMo. § 300.175.
[Code 1964, § 17-42]
No person shall, without lawful authority, attempt to or in fact alter, deface, injure, knock down or remove any official traffic control device or any railroad sign or signal or any inscription, shield or insignia thereon, or any other part thereof.
[1]
State law reference — Similar provisions, RSMo. § 300.180.
[Code 1964, §§ 17-43, 17-44]
The city police department is hereby authorized:
(1) 
To designate and maintain, by appropriate devices, marks, or lines upon the surface of the roadway, crosswalks at intersections where in its opinion there is particular danger to pedestrians crossing the roadway, and at such other places as it may deem necessary;
(2) 
To establish safety zones of such kind and character and at such places as it may deem necessary for the protection of pedestrians.
[1]
State law reference — Similar provisions, RSMo. § 300.195.
[Code 1964, § 17-45]
(a) 
The city police department is hereby authorized to mark traffic lanes upon the roadway of any street or highway where a regular alignment of traffic is necessary.
(b) 
Where such traffic lanes have been marked, it shall be unlawful for the operator of any vehicle to fail or refuse to keep such vehicle within the boundaries of any such lane except when lawfully passing another vehicle or preparatory to making a lawful turning movement.
[1]
State law reference — Similar provisions, RSMo. § 300.200.