Different colour hats signify different things on site, letting workers know who is who and carrying out what role. Although this colour coding system differs from country to country and even within individual organisations, there are a few basic rules that can help you to identify workers from the colour of their hats.

White - Site managers, foremen, engineers or supervisors usually wear white hats on site.
Yellow - General labourers and earth moving operators.
Blue - Carpenters and other technical operators including electricians will normally wear blue hard hats.
Green - Green often signifies a safety inspector but can also be used by new workers on site.
Red - Fire Marshal's usually wear red hard hats
Brown - Brown hats are worn by welders and other workers with high heat applications.
Grey - Grey is the colour often worn by site visitors.
Pink – For when employees forget their hats or misplace them!