In Switzerland, interchangeable number plates are available for cars and almost everything else that is motorized: interchangeable numbers are also available for motorcycles, vintage cars or sports cars, tractors or trailers. Depending on the vehicle group, each canton has slightly different rules, but one thing applies throughout Switzerland: If you are the owner of two vehicles of the same category in the same canton, you can apply for an interchangeable number plate.
Watch out: You still need a proof of insurance for both vehicles. And of course, you may only drive the vehicle on which the interchangeable plate is currently attached.