Health and safety sign with “Danger demolition in progress” written in black on a yellow background which indicates a warning of a possible hazard. · · · Semi rigid sign · · Black font on a yellow background · · Warns people of the danger of demolition work in progress. · · Helps to prevent accidents. · · The sign can help to raise awareness of the dangers of demolition work. · · The sign can help to deter people from entering areas where demolition work is in progress.