Stop sign
Come to a complete stop at the line, the crosswalk or the edge of the intersection, then proceed only when it is safe.
How to recognise it
This sign is an eight sided octagon in red, the colour reserved for prohibition and stopping. These carry the force of law. Ignore one and you have broken a traffic rule, not just a guideline. Most are white rectangles with black text, and the handful that are not, the stop and yield signs, get their own unmistakable shapes.
What the test wants you to know
The octagon is reserved for this one sign so a driver can recognise it from behind or in snow when the face is unreadable. Tests love asking what a complete stop means: the wheels stop turning, and rolling through at walking pace is still a violation.
Practise it
Reading about a sign is not the same as recognising it in half a second with an examiner watching. Every state road signs test on this site shows the sign and asks you to name it, then shows four faces and asks you to pick the right one.
Yield
Do Not Enter
Wrong Way
Speed Limit
One Way
No U Turn