Virginia has TWO laws which apply in this situation.
§ 46.2-804. Special regulations applicable on highways laned for traffic.
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;
(remainder snipped because it talks about two-lane and three-lane highways)
(Code 1950, § 46-222; 1952, c. 671; 1958, c. 541, § 46.1-206; 1962, c. 87; 1979, c. 25; 1985, c. 481; 1989, c. 727.)
§ 46.2-842.1. Drivers to give way to certain overtaking vehicles on divided highways.
It shall be unlawful to fail to give way to overtaking traffic when driving a motor vehicle to the left and abreast of another motor vehicle on a divided highway. On audible or light signal, the driver of the overtaken vehicle shall move to the right to allow the overtaking vehicle to pass as soon as the overtaken vehicle can safely do so. A violation of this section shall not be construed as negligence per se in any civil action.
(1989, c. 708, § 46.1-211.1.)
§ 46.2-804. Special regulations applicable on highways laned for traffic.
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;
(remainder snipped because it talks about two-lane and three-lane highways)
(Code 1950, § 46-222; 1952, c. 671; 1958, c. 541, § 46.1-206; 1962, c. 87; 1979, c. 25; 1985, c. 481; 1989, c. 727.)
§ 46.2-842.1. Drivers to give way to certain overtaking vehicles on divided highways.
It shall be unlawful to fail to give way to overtaking traffic when driving a motor vehicle to the left and abreast of another motor vehicle on a divided highway. On audible or light signal, the driver of the overtaken vehicle shall move to the right to allow the overtaking vehicle to pass as soon as the overtaken vehicle can safely do so. A violation of this section shall not be construed as negligence per se in any civil action.
(1989, c. 708, § 46.1-211.1.)