Hi, i have just returnd from my first ever trip with my wife it was a very enjoyable experience howevern one stretch of A road that had been resurfaced with loose chippins it had a speed restriction of 20mph with no overtaking this was a card sign put their by the contracters i was doing 25,then a 4x4 towing a large caravan overtook me doing about 50-60mph with chipins flying every where if that 4x4 had to brake it would have been all over the road or ditch,my quetion is! are these speed restrictions legal,steve