All vehicles have hit points, which are roughly equivalent to a character’s hit points. Like most inanimate objects, vehicles also have hardness. Whenever a vehicle takes damage, subtract the vehicle’s hardness from the damage dealt.
When a vehicle is reduced to 0 hit points, it is disabled. Although it might be repairable, it ceases functioning. A vehicle that is disabled while moving drops one speed category each round until it comes to a stop. The driver cannot attempt any maneuvers except a 45-degree turn.
Unlike characters, vehicles don’t “die” when they reach –10 hit points. Instead, a vehicle is destroyed when it loses hit points equal to twice its full normal total. A destroyed vehicle cannot be repaired.
Exploding Vehicles: If the attack that disables a vehicle deals damage equal to half its full normal hit points or more, the vehicle explodes after 1d6 rounds. This explosion deals 10d6 points of fire damage to everyone within the vehicle (Reflex save, DC 20, for half damage), and half that much to everyone and everything within 30 feet of the explosion (Reflex save, DC 15, for half damage).