Yvonne
Just do what a friend of mine used to do. Sit right behind the driver and, everytime he starts to go a bit too fast for your liking, tap him smartly on the shoulder and say "Siga Siga megale, thelo na ftaso simera, ochi hthes", which means "Slow down lad, I want to arrive today not yesterday".
After doing that a couple of times, they usually get the message.
Or, you could just make sure you have had a nice half bottle of wine on the plane - that way, you'll not be drunk, but you will probably be less bothered,
Stuart