High visibility clothing must be worn in this area - RPVC (200 x 300mm). This High Visibility Clothing Must Be Worn In This Area Sign is a 200mm x 300mm mandatory sign made from non adhesive Rigid PVC. All our signs conform to the BS EN ISO 7010 regulation, ensuring that all graphical safety symbols are consistent. It features text and illustration to remind that high vis clothing (vests etc) must be worn.