bad dog behaviour in car, please help me!

[evalovinlucy]

My three year old male miniture manchester terrier is absolutly hopeless in the car. He wriggles whines and cries in the car, even on short rides.
We have tried rewarding his moments of quietness and yelling at him when he dosn't stop, but nothing seems to help.
We are planning on going on holidays soon and that means two and a half hours in the car. we really want to bring him but we are afraid we will not be able to cope with his noise. does anyone have and advice, techniques, or anything helpful that I can work with?
Please help. love Lucy