rear marker boards in spain

If anyone is going to spain this summer for the first time, just a reminder that anyone with an outfit or motorhome over 12 mitres long must display marker boards at the rear of your outfit, the one's I use are the same as on the back of h.g.v vehicles, it has been law in spain for about two years. I fix mine bolted to two awning poles and clamped to the rear grab handles so that they can be taken off when we get home, but I have seen some put on with two way stick on pads, the type used for number plates.