One for our Spanish residents

Apparently You now need reflective signs ( as seen on the rear of HGVs ) on your caravan to travel in Spain if your unit is over 12 metres long. These signs are not legal for travel in the UK.
Is this true, if so are they the standard markings which would be on a truck?

not really sure about length but there is a euro law coming in about reflective strips on the side of trailers like the italians have on their trailers, all i saw in our garage was it comes in for new trailers this year then retro fitted after that