For the purposes of this section, “traffic lines” includes any temporary traffic control devices used to emulate the lines and markings in subdivisions 6 and 7. Whenever any roadway has been divided into clearly marked lanes for traffic, drivers of vehicles shall obey the following:
1. Any vehicle proceeding at less than the normal speed of traffic at the time and place and under the conditions existing, shall be driven in the lane nearest the right edge or right curb of the highway when such lane is available for travel except when overtaking and passing another vehicle or in preparation for a left turn or where right lanes are reserved for slow-moving traffic as permitted in this section;
2. A vehicle shall be driven as nearly as is practicable entirely within a single lane and shall not be moved from that lane until the driver has ascertained that such movement can be made safely;
3. Except as otherwise provided in subdivision 5, on a highway which is divided into three lanes, no vehicle shall be driven in the center lane except when overtaking and passing another vehicle or in preparation for a left turn or unless such center lane is at the time allocated exclusively to traffic moving in the direction the vehicle is proceeding and is signed or marked to give notice of such allocation. 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. The Commissioner of Highways, or local authorities in their respective jurisdictions, may designate right lanes for slow-moving vehicles and the Virginia Department of Transportation shall post signs requiring trucks and combination vehicles to keep to the right on Interstate Highway System components with no more than two travel lanes in each direction where terrain is likely to slow the speed of such vehicles climbing hills and inclines to a speed that is less than the posted speed limit;
5. Wherever a highway is marked with double traffic lines consisting of a solid line immediately adjacent to a broken line, no vehicle shall be driven to the left of such line if the solid line is on the right of the broken line, except (i) when turning left for the purpose of entering or leaving a public, private, or commercial road or entrance or (ii) in order to pass a pedestrian or a device moved by human power, including a bicycle, skateboard, or foot-scooter, provided such movement can be made safely. Where the middle lane of a highway is marked on both sides with a solid line immediately adjacent to a broken line, such middle lane shall be considered a left-turn or holding lane and it shall be lawful to drive to the left of such line if the solid line is on the right of the broken line for the purpose of turning left into any road or entrance, provided that the vehicle may not travel in such lane further than 150 feet;
6. Wherever a highway is marked with double traffic lines consisting of two immediately adjacent solid yellow lines, no vehicle shall be driven to the left of such lines, except (i) when turning left or (ii) in order to pass a pedestrian or a device moved by human power, including a bicycle, skateboard, or foot-scooter, provided such movement can be made safely; and
7. Whenever a highway is marked with double traffic lines consisting of two immediately adjacent solid white lines, no vehicle shall cross such lines. A violation of this section is punishable by a fine of $100.