breaks while traveling. you can bring a litter box with you and make your cat to pee or poop on it. by any chance, you are taking the cat outside the car, make sure it is wearing a collar with an id tag and the harness or collar should be attached to a leash which will make sure that it can’t run away or jump out of arms.
you should never keep your cat alone in the car and leave. especially when it is hot and sunny. if the cat is left inside the hot car, it can suffer from organ damage or die due to the heat in the worst 