Towed Caravans Prohibited Post Mounted Sign - Dia 622.7 R2/RA2 (Face Only)The caravans prohibited sign, diagram 622. 7, should mark areas where towed caravans are unsuitable for the road. There should always be an alternative route, however. This may be needed at narrow roads such as village streets and residential areas near a caravan site, or where there is a steep incline. The caravan sign may be supplemented to show a time period, for when traffic may be heavy and slowed by a towed caravan within the detailed time