Vehicle is an artifact subtype introduced in Kaladesh. It was also used in Aether Revolt and quickly returned in Ixalan block and Dominaria. Afterwards, they became deciduous.
Vehicle cards have a special bronze and grey blocked card frame and a power/toughness printed in a bronze colored box. However, vehicles don’t have a power or a toughness unless they become creatures.
Artifacts with this subtype have the crew keyword, which allows them to temporarily become artifact creatures. Creatures with the Pilot type have an ability that somehow pertains to crewing Vehicles.
If the effect turning your Vehicle into an artifact creature doesn’t specify its power and toughness, the printed power and toughness on the Vehicle is used. Other effects may turn a Vehicle into an artifact creature but specify its power and toughness. In that case, use the specified power and