I used to take my cats to central Oregon from Vancouver, BC every summer. It was about a 8-9hr drive. They were SO good in the car, and when we did stop at a hotel (sometimes we broke the trip into two days) I also had a disposable litter pan for the hotel room and they were very happy to be allowed to sleep near me. I would let them have the choice of crate or lap in the car and always had a litter box in there (they usually ended up in the crates anyway, but I didn't have a big crate and I knew that sometimes they wanted to be near me. I wasn't driving when they sat with me). Tilly always pukes in the car but she usually wants to do it in the litter box (I wish she would do that at home!). If we had to stop anywhere I would crate them again before anyone was allowed to open the car door.