I have come across a number of patients who have motion sickness when driving in a car. There are various reasons for motion sickness. It's interesting to me that many of my patients who have this experience more problems when sitting in the back seat of a car as compared to the front seat. More importantly, the problem is significantly reduced when they're actually driving.

I feel some component of this is visual. There's a lot more visual information an individual has to assimilate in the back seat. The passenger is looking at distances two feet away and also things that are very far away. In the front seat they're viewing things mostly at distance. When they're driving, they're actually holding onto the steering wheel so they know where they're going and the tactual sense is reinforcing the visual sense, therefore less problem.