As we are planning a trip to Italy this summer I'm trying to work out the compulsory things to take. I've seen the rectangular warning signs advertised for use on the back of the motorhome if you have a load such as bikes. We have a bike rack fitted but wont be taking bikes with us (only got space for 2 bikes and 4 people going on the trip). Do we need to fit a warning sign to the folded rack? Is there a stated minimum overhang which triggers the need for the sign?