In Norway cars seem to have different colour number plates (same colour for front and back).
Wikipedia tells me that it's to do with the type of tax paid, the green is for cars, vans, small trucks equipped with only one row of seats. Normal cars, coaches and lorries all seem to have white plates.
There are also other colours, but the only ones I've seen were red which are car dealers plates.
I'm glad I'm not here when you need these studded tyres.
Or this form of transport.
