SOLUTION

The shape and color of a mandatory sign is Circular shape – white symbol on blue background

Mandatory signs, also known as compulsory signs, indicate actions that must be taken. Their shape and color are standardized for easy recognition and universal understanding.

Shape:

Mandatory signs are always circular. This distinct shape helps them to be quickly identified and differentiated from other types of safety signs (e.g., prohibition signs are circular with a red diagonal line, warning signs are triangular).

Color:

The background of a mandatory sign is blue, and the symbol or pictogram illustrating the required action is white. This color combination is specifically chosen for its high contrast and visibility.

Purpose:

The purpose of mandatory signs is to clearly and unambiguously instruct people to perform a specific action. Examples include:

• Wearing personal protective equipment (PPE) such as safety helmets, safety glasses, ear protection, or safety footwear.
• Keeping walkways clear.
• Using pedestrian crossings.

Examples of Mandatory Signs:

• A blue circle with a white hard hat symbol means “Safety helmet must be worn.”
• A blue circle with white safety glasses means “Eye protection must be worn.”
• A blue circle with white ear muffs means “Ear protection must be worn.”