I'm not so good with scripting
,
First, use a script that checks if the driver is dead: ! (not alive) whatever
Then, write something like
UnitName MoveInDriver
VehicleName;
UnitName being the driver-to-be and
VehicleName is (duh) the name of the vehicle.
OR
Using the the script to check if the driver is dead; you can delete him and do what needs to be done.
I hope that helps. This is something I just picked off the top of my head
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Beware the GrimMonkey