Store decoration tin signs include motorcycle tin sign, vintage metal tin sign, vintage decoration metal signs, warning metal signs, etc. A warning sign is a type of sign which indicates a potential hazard, obstacle, or condition requiring special attention. Some are traffic signs that indicate hazards on roads that may not be readily apparent to a driver. While warning traffic sign designs vary, they usually take the shape of an equilateral triangle with a white background and thick red border. http://www.tin-sign.com/tin-sign/store-decoration-tin-signs/