The “bug out” vehicle is the vehicle or mode of transportation that someone who is fleeing (or, “getting out of dodge) uses to get to their location in an unhampered and expeditious manner.
BoVs are often used to get to a BoL or rendezvous location. BoVs could be anything from an electric-assisted bicycle to a paraglider. Generally, the BoV is selected so that it can carry the person plus their BoB across uneven terrain. It should generally be assumed that fuel will not be readily available and that off-road travel will be required.