Troops aboard vehicles can fire from firing slits, hatches or over the sides of the fighting compartment if the vehicle is open-topped. Normally only half of the models aboard a vehicle can fire from it because of the limited number of places to fire from. However all of the models aboard an open-topped vehicle can fire.
Troops firing from a vehicle count as moving if the vehicle moves and may not fire if the vehicle moves faster than 12".
Errata — Chapter Approved: Main Rules Clarifications (v2.0): Template weapons may be fired from a vehicle – just assume the shooter aims over the vehicle's hull from their fire point.
Errata — Chapter Approved: Main Rules Clarifications (v2.0): Transported troops are prohibited from shooting if in a vehicle that has discharged smoke launchers.