Travelling by car with your bike is much easier if you can carry it on the outside. It doesn't take up any room inside the vehicle and you don't get mud and grease all over your upholstery. The simplest racks to use fit onto the rear of the car. Most grip the vehicle with plastic-coated hooks which must be positioned where they can spread the load. With all these racks, it's vital that the rack is firmly attached to the car and it's best if you then fix the bikes to the car itself, not just to the rack. If you have a tow-ball, use it! That way, the rack won't even touch the car and the whole setup is really secure. If your car has roof rails, you can mount cycle carriers to them. This works well but be careful when entering car parks with height barriers! Whichever type you choose, make sure you lock the bikes to the car if you want to keep them.