From http://www.vdot.virginia.gov/programs/bk-laws.asp
“Passing
Bicyclists may overtake and pass another vehicle only when safe to do so. Bicyclists may pass another vehicle on the right or left, and they may stay in the same lane, change lanes, or ride off the road if necessary for safe passing. Please note that passing motor vehicles on the right side may be extremely dangerous if the motorist does not see the bicyclist and attempts a right turn.
A person riding a bicycle, electric personal assistive mobility device, electric power-assisted bicycle, motorized skateboard or scooter, or moped shall not travel between two lanes of traffic moving in the same direction, except where one lane is a separate turn lane or a mandatory turn lane.
Motorists must approach and pass a bicyclist at a reasonable speed at least two feet to the left of the bicyclist. [bold and underlining added]
Reference: ยงยง46.2-839,46.2-907 ^TOPICS”