If you haven’t travelled with your rabbit before have a trial short journey. That way, before you make a long trip, you can see how your rabbit responds and if there’s anything else you can do to help them on your travels.
It’s best to avoid long journeys with your rabbit, but if it’s unavoidable, check your bunnies often and have regular breaks.
If you’re travelling to the vet, find a practice which is close to home so the time spent in the car is minimal.
Rabbits do not tolerate heat well, so you’ll need to ensure your vehicle is kept cool and well ventilated, using air conditioning if necessary. Avoid travelling during the hottest parts of the day as rabbits can really suffer if they overheat. If it’s a really hot day cool the car before you put your rabbit in.
Crucially, never leave a rabbit unattended in a vehicle as heatstroke can occur even on cool days.