[R.O. 2007 § 325.010; Ord. No. 496 § 1, 3-22-1979; Ord. No. 3820 § 15, 4-24-2003]
A. 
The driver of a vehicle intending to turn at an intersection shall do so as follows:
1. 
Right Turns. Both the approach for a right turn and a right turn shall be made as close as practicable to the right-hand curb or edge of the roadway, except where multiple turn lanes have been established.
2. 
Left Turns On Two-Way Roadways. At any intersection where traffic is permitted to move in both directions on each roadway entering the intersection, an approach for a left turn shall be made in that portion of the right-half of the roadway nearest the centerline thereof and by passing to the right of such centerline where it enters the intersection and after entering the intersection, the left turn shall be made so as to leave the intersection to the right of the centerline of the roadway being entered. Whenever practicable, the left turn shall be made in that portion of the intersection to the left of the center of the intersection.
3. 
Left Turns On Other Than Two-Way Roadways. At any intersection where traffic is restricted to one (1) direction on one (1) or more of the roadways, the driver of a vehicle intending to turn left at any such intersection shall approach the intersection in the extreme left-hand lane lawfully available to traffic moving in the direction of travel of such vehicle and after entering the intersection, the left turn shall be made so as to leave the intersection, as nearly as practicable, in the left-hand lane lawfully available to traffic moving in such direction upon the roadway being entered, except where multiple turn lanes have been established.
4. 
Designated Two-Way Left Turn Lanes. Where a special lane for making left turns by drivers proceeding in opposite directions have been indicated by official traffic control devices:
a. 
A left turn shall not be made from any other lane;
b. 
A vehicle shall not be driven in the lane except when preparing for or making a left turn from or into the roadway or when preparing for or making a U-turn when otherwise permitted by law; and
c. 
A vehicle shall not be driven in the lane for a distance more than five hundred (500) feet.
[R.O. 2007 § 325.020; Ord. No. 496 § 1, 3-22-1979]
A. 
The City Traffic Engineer is authorized to place markers, buttons, or signs within or adjacent to intersections indicating the course to be traveled by vehicles turning at such intersections, and such course to be traveled as so indicated may conform to or be other than as prescribed by law or ordinance.
B. 
When authorized markers, buttons, or other indications are placed within an intersection indicating the course to be traveled by vehicles turning thereat, no driver of a vehicle shall disobey the directions of such indications.
[R.O. 2007 § 325.030; Ord. No. 496 § 1, 3-22-1979]
The City Traffic Engineer is hereby authorized to determine those intersections at which drivers of vehicles shall not make a right, left or U-turn, and shall place proper signs at such intersections. The making of such turns may be prohibited between certain hours of any day and permitted at other hours, in which event the same shall be plainly indicated on the signs or they may be removed when such turns are permitted.
[R.O. 2007 § 325.040; Ord. No. 496 § 1, 3-22-1979]
Whenever authorized signs are erected indicating that no right or left or U-turn is permitted, no driver of a vehicle shall disobey the directions of any such sign.
[R.O. 2007 § 325.050; Ord. No. 496 § 1, 3-22-1979]
The driver of any vehicle shall not turn such vehicle so as to proceed in the opposite direction upon any street in a business district and shall not upon any other street so turn a vehicle unless such movement can be made in safety and without interfering with other traffic.
A. 
Upon all public roads or highways of sufficient width, a vehicle shall be driven upon the right-half of the roadway, except as follows:
1. 
When overtaking and passing another vehicle proceeding in the same direction pursuant to the rules governing such movement;
2. 
When placing a vehicle in position for and when such vehicle is lawfully making a left turn in compliance with the provisions of this Title;
3. 
When the right-half of a roadway is closed to traffic while under construction or repair; or
4. 
Upon a roadway designated by local ordinance as a one-way street and marked or signed for one-way traffic.
B. 
It is unlawful to drive any vehicle upon any highway or road which has been divided into two (2) or more roadways by means of a physical barrier or by means of a dividing section or delineated by curbs, lines or other markings on the roadway except to the right of such barrier or dividing section or to make any left turn or semi-circular or U-turn on any such divided highway, except at an intersection or interchange or at any signed location designated by the State Highways and Transportation Commission or the Department of Transportation. The provisions of this Subsection shall not apply to emergency vehicles, law enforcement vehicles or to vehicles owned by the Commission or the Department.
C. 
Whenever any roadway has been divided into three (3) or more clearly marked lanes for traffic, the following rules in addition to all other consistent herewith shall apply:
1. 
A vehicle shall be driven as nearly as practicable entirely within a single lane and shall not be moved from such lane until the driver has first ascertained that such movement can be made with safety.
2. 
Upon a roadway which is divided into three (3) lanes, a vehicle shall not be driven in the center lane except when overtaking and passing another vehicle where the roadway ahead is clearly visible and such center lane is clear of traffic within a safe distance, or in preparation for a left turn, or where such center lane is at the time allocated exclusively to traffic moving in the direction the vehicle is proceeding and is signposted to give notice of such allocation.
3. 
Upon all highways any vehicle proceeding at less than the normal speed of traffic thereon shall be driven in the right-hand lane for traffic or as close as practicable to the right-hand edge or curb, except as otherwise provided in Sections 304.014 to 304.026, RSMo.
4. 
Official signs may be erected by the State Highways and Transportation Commission or the Highway Patrol may place temporary signs directing slow-moving traffic to use a designated lane or allocating specified lanes to traffic moving in the same direction and drivers of vehicles shall obey the directions of every such sign.
5. 
Drivers of vehicles proceeding in opposite directions shall pass each other to the right and, except when a roadway has been divided into traffic lanes, each driver shall give to the other at least one-half (½) of the main traveled portion of the roadway whenever possible.
D. 
All vehicles in motion upon a highway having two (2) or more lanes of traffic proceeding in the same direction shall be driven in the right-hand lane except when overtaking and passing another vehicle or when preparing to make a proper left turn or when otherwise directed by traffic markings, signs or signals.
E. 
All trucks registered for a gross weight of more than forty-eight thousand (48,000) pounds shall not be driven in the far left-hand lane upon all interstate highways, freeways, or expressways within urbanized areas of the State having three (3) or more lanes of traffic proceeding in the same direction. This restriction shall not apply when:
1. 
It is necessary for the operator of the truck to follow traffic control devices that direct use of a lane other than the right lane; or
2. 
The right half of a roadway is closed to traffic while under construction or repair.
F. 
As used in Subsection (E) of this Section, "truck" means any vehicle, machine, tractor, trailer, or semitrailer, or any combination thereof, propelled or drawn by mechanical power and designed for or used in the transportation of property upon the highways. The term "truck" also includes a commercial motor vehicle as defined in Section 300.010 of this Title.