This site safety prohibition sign is available in Self Adhesive Vinyl, Rigid Plastic or Rigid Plastic with Self Adhesive on the back. Keep out. Construction sites are dangerous sign is printed to the highest quality. This sign is from our site safety signs range of prohibition signs and is great value for money. These prohibition signs feature prominent wording to inform of prohibited actions at your office, site or event. Can't find what you need? We print 1000's of prohibition signs each week and can easily amend wording, graphics or sizes on any of our standard signs. Just contact our team today.