SIA Door Supervisor Training Module 1 Practice Test

A solid blue circle safety sign denotes which category of instruction?

A warning sign An informational sign A mandatory sign A prohibition sign

Correct Answer:

A mandatory sign

Explanation:

In safety signs, color and shape indicate the type of instruction. A solid blue circle represents a mandatory instruction—something you must do to stay safe. The blue color signals an obligation, and the circular shape shows it’s a required action (for example, wear the designated PPE or follow a specified procedure). This is different from warning signs, which are typically yellow and indicate hazards, and from prohibition signs, which use red to show actions you must not take.

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