Here is a few information about what the words mean and how they work...
Prohibitive Sign: A Prohibitive sign is a safety sign and it is likely to cause a risk to your health or your safety. It is expected to be a red circle with a diagonal cross through to show that you are banned and forbidden to do it.
Mandatory Sign: Mandatory signs are road signs which are mainly used to tell the traffic specific things to do, if not followed you're risking your life. Unlike prohibitive signs, mandatory signs tell traffic what they must do and what not to.
Hazard Sign: Hazard signs or warning symbols are symbols designed to warn about the hazardous or dangerous objects, place or matter, including electric currents, poisons and radioactivity. The use of hazard sign is often ordered by law and other standards groups.
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