[Alison_inPA]

If you can get him to look outside the car at the horizon ahead of you during the time when he's awake, that will probably help. It will probably require some reminding, though, until he makes a habit of it. Looking at something stationary in the distance helps the brain to get a point of reference and compensate for the motion.

Some people who get carsick say that mints or hard candies or gum help reduce the queasiness. For others, though, it makes it worse, as does anything else with a strong scent or taste. Our oldest girl would get carsick at times even on short rides, and she claimed that gum helped her. (She considered gum to be a necessity of life even if we weren't in the car!) She would also refuse to eat anything before getting in the car. I'm not sure that actually help with the carsickness, but she was so concerned at times about getting carsick that there was no arguing with her.

My brother has been prone to motion sickness his whole life. He believes that fresh air and a visible horizon help him the most. Any kind of scent at all in the interior of the car is likely to set him off throwing up.