By communicating information and alerting people about potential hazards, safety signs and labels can be an effective tool for helping prevent accidents and injuries. Workers are alerted to the possibility of injury by signs and labels that indicate the presence of hazardous materials, chemicals, and gases. Construction zones are identified by signs and labels indicating entry restrictions and hazards. Fire safety signs and labels for hot surfaces and work remind people to take precautions to prevent fires. Lockout safety signs and labels are available to ensure the safety of employees while servicing equipment. Machine hazard signs and labels promote safe machine operation by providing instructions and discouraging unauthorized use. Signs and labels indicating the necessity of wearing personal protective equipment are placed in potentially hazardous areas.