Leaving the house with a child who is just learning how to use the potty can be challenging. Have him or her use the potty before getting in the car.
If it will be an extended car trip, take the potty seat with you. If you get short notice, or are at a location without child-friendly toilets, you can put it on the ground and let them comfortably use it there. Some families have even opened up the back of the SUV and turned it into a private toileting area by using the potty seat. A disposable Travel John solidifies liquids instantly into an odorless spill-proof gel. These are handy to keep in the glove compartment for any age child (or even adult emergencies.)
Folding toilet seat reducers can be used at grandparents or even airports or shopping centers. They are cleaner than most public toilet seats and can be wiped off with a wet wipe before putting them away. Some children are frightened of the split seat that many public restrooms have. The toilet seat reducer can be positioned backwards to cover this split.
Automatic flushing toilets in public restrooms can be scary if they flush while your child is still sitting there. Covering the “eye” with a sticky note will prevent the toilet from flushing until you’re ready.