Potty training and long trips

My daughter is doing really good with potty training and hasn’t had an accident in a few days. Next month we are going on a 3 hour car ride and was wondering how you guys handle potty breaks that long? She is my first so I’m not familiar with potty training. When we go out for a few hours shopping or what it I bring her potty seat and she goes pee while sitting on it in the car or if we are somewhere that has a potty she will go there. Never been on a long car ride without diapers!