For many people this is the time of year when they head out on holiday. And who doesn’t love a road trip? But for the car, a long drive in hot weather, loaded down with family and luggage, is hard work.That’s why a pre-holiday checkup is a good idea. The first-aid kit should to be up-to-date, complete and easily accessible. And when it comes to packing luggage in the trunk, following a few important rules will also help keep you safe.