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Whenever any roadway has been divided into two or more clearly marked lanes for traffic, or wherever within the Municipality traffic is lawfully moving in two or more substantially continuous lines in the same direction, the following rules apply:
(a) A vehicle shall be driven, as nearly as is practicable, entirely within a single lane or line of traffic and shall not be moved from the lane or line until the driver has first ascertained that the movement can be made with safety.
(b) Upon a roadway which is divided into three lanes and provides for the two-way movement of traffic, a vehicle shall not be driven in the center lane, except when overtaking and passing another vehicle where the roadway is clearly visible and the center lane is clear of traffic within a safe distance, or when preparing for a left turn, or where the center lane is at the time allocated exclusively to traffic moving in the direction the vehicle is proceeding, and is posted with signs to give notice of such allocation.
(c) Official signs may be erected directing specified traffic to use a designated lane or designating those lanes to be used by traffic moving in a particular direction, regardless of the center of the roadway, or restricting the use of a particular lane to only buses during certain hours or during all hours, and drivers of vehicles shall obey the directions of such signs.
(d) Official traffic-control devices may be installed prohibiting the changing of lanes on sections of roadway, and drivers of vehicles shall obey the directions of every such device.