Except as otherwise provided by law, when crossing an intersection of highways or the intersection of a highway by a railroad right-of-way, the driver of a vehicle shall drive on the right half of the roadway unless it is obstructed or impassable. When crossing an intersection of highways, however, the driver of a vehicle may overtake or pass another vehicle in the intersection if such intersection is designated and marked as a passing zone.
Va. Code § 46.2-803