An anti static strip (not a mat lol sorry my mistake) can be attached to the bumper of the car, the belief is that while driving in a charged car the body tries to protect itself of the high voltage electrical charge accumulated on the body of your car which is sometimes belived to cause travel sickness, the strips are designed to ground your car and release the static electricity..
Pearl used to get awfully sick even when I held back on feeding her to try and get her through a car journey since I got told about them and since I attached the strips shes really not been so bad and can tolerate journeys much better than she used to, you can get them from here http://www.extremeautoaccessories.co...p?section=1205 I brought mine online but I suppose any good Halfords store would have them