What does the yellow stop ahead sign mean?
A stop sign is ahead. Slow down and prepare to stop
This is a "stop ahead" warning sign: a stop sign is coming up, possibly hidden by a curve or hill. Slow down now so you can come to a full stop when you reach it.
Why the other answers are wrong
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You must stop right here
The order to stop comes from the red eight-sided sign itself. This yellow diamond is a warning placed before it, giving you room to slow down and stop in the right spot.
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A stop sign has been removed ahead
Warning signs tell you what is coming, not what used to be there. The stop symbol under the arrow means a real stop sign is waiting for you further along this road.
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No stopping is allowed ahead
A no stopping rule comes on a regulatory sign, posted in pairs with a red circle and slash to mark the zone. This yellow diamond carries a stop sign symbol, the opposite message.
Quick way to remember
A yellow diamond warns of something ahead; the symbol shows exactly what.
Based on the official Ontario MTO Driver's Handbook.
Reading it once is not enough
Drill this question in a scored round and find out what else you are shaky on.
Practise Road Signs: Warnings