§ 39-10-17 — Driving on roadways laned for traffic

Whenever any roadway has been divided into two or more clearly marked lanes for traffic,
the following rules in addition to all others consistent herewith apply:
1. A vehicle must be driven as nearly as practicable entirely within a single lane and may
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 lanes and provides for two-way traffic, a
vehicle may not be driven in the center lane except when overtaking and passing
another vehicle traveling in the same direction when such center lane is clear of traffic
within a safe distance, or in preparation for making a left turn or where such center
lane is at the time allocated exclusively to traffic moving in the same direction that the
vehicle is proceeding and such allocation is designated by official traffic-control
devices.
3. Official traffic-control devices 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 and drivers of vehicles shall obey the
directions of every such device.
4. 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.