For example, a flammable liquid store or a laboratory where radioactive substances are in use should have an appropriate warning sign near the entrance. These signs are required by the Health and Safety (Safety Signs and Signals) Regulations and in specific cases by the Dangerous Substances (Notification and Marking of Sites) Regulations. Signs warning of a particular hazard consist of a black band in the shape of an equilateral triangle. The background within the band should be yellow with the pictogram indicating the type of hazard in black positioned centrally on the sign.
