With Jazz being able to see where she's going has no effect at all. Even in the harness, where it's all open air around her, she gets sick. I love the harness, where we can hold up the trash can in front of her, she throws up right in it like the good girl she is, and we can carry on.
Actually, Keoki threw up in the car today, twice, which was odd. Although, the roads we were on were a bit curvy, so that may have gotten to him.
I am a huge fan of the harnesses for dogs who get carsick and for dogs who have crate anxiety!