Chariots are always moved as individual models in the same way as powerful characters and large monsters. If you have several chariots then you can choose to move them together in a loose formation if you wish, but you do not have to do so. The only advantage of lumping your chariots together is that they will benefit from making all leadership tests on the best leadership value of the group in exactly the same way as any unit of troops led by a heroic character.
To count as grouped together in this way each chariot must be within 5" of another chariot in the same group forming a rough line or clump.
A chariot moves at the same speed as the creature that pulls it. Chariots can never make a march move, although they double their move when charging in the same way as other models. When you move a chariot model simply measure the distance and make your move. There is no need to turn or wheel, as the chariot is able to turn freely to face any direction you wish.
Chariots cannot move over obstacles or difficult terrain, except to cross a river at a bridge or a ford. A chariot compelled for some reason to move over terrain it cannot normally cross is likely to be damaged as its wheels strike rocks, its body becomes entangled in undergrowth, or it careers headlong through a wall. If forced by circumstance into difficult terrain or over an obstacle the chariot sustains D6 strength 6 hits. These are randomly distributed among the chariot, crew, and creatures in the same way as hits from shooting (see below for a description of how to do this). Chariots sometimes have to cross obstacles or difficult terrain for reasons beyond their control, for example if they are forced to flee from close combat.