Setting aside signs with a unique shape of their own like stop and yield, what shape are most regulatory signs?

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Correct answer: D. Rectangular or square

Regulatory signs are usually rectangular or square — a shape family shared with information signs, which is why colour (white background for regulatory) matters as much as shape for telling them apart.

Source: MTO Driver's Handbook: Signs — Regulatory sign shapes

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More Sign Shapes & Colours questions

You see a regulatory sign with a green circle around a symbol. What does the green circle mean?
The Ontario Traffic Manual ranks sign categories by how critical they are for a driver to notice and react to in time. Which category sits at the very top of that hierarchy, even above regulatory signs like STOP and speed limit signs?
What shape and colour scheme do regulatory signs generally use?
A temporary condition sign (like a construction warning) is the same diamond shape as a regular warning sign. How can you tell them apart at a glance?

Study the rules first in the Sign Shapes & Colours guide, or browse all free G1 questions.