Characters can ride chariots in much the same way they ride large monsters. When shooting at a chariot, the hits are randomised between the character and the chariot itself. Roll a D6. On a roll of 6, the attack hits the character. On a 1-5, it hits the chariot. Work out damage in the normal manner, except that the character either gains a +2 armour save bonus for riding the chariot or can use the armour save value of the chariot, whichever is the best.
In close combat, enemies can choose whether to attack either the chariot or the character riding it, in the same manner as combat against characters riding monsters.
If a chariot is destroyed, any characters in the chariot will continue to fight on foot. Such characters are immediately placed by the controlling player anywhere within 2" of the place where the chariot was. If the chariot was in close combat when it was destroyed, the controlling player places the character in base contact with the enemies that were in base contact with the chariot and the fight continues as normal.