What does the crossroad ahead warning sign mean?
An intersection (crossroad) is ahead. Watch for crossing traffic
This warning sign means an intersection (a crossroad) is ahead. Slow down, watch for vehicles that may enter or cross your path, and be ready to yield as required.
Why the other answers are wrong
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A railway crossing is ahead
Railway warnings carry a train or track symbol, and the crossing itself is marked by the X-shaped white sign with a red border. Here you see two plain roads meeting.
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A four-way stop must be obeyed right here
A yellow diamond warns about what is coming, it never orders a stop. An actual stop is ordered by the eight-sided red stop sign at the intersection itself.
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A pedestrian crossover is ahead
A pedestrian crossover is marked by its own sign showing a walking person, and it tells you to yield to people crossing. This symbol shows two roads, no person.
Quick way to remember
The black symbol shows two roads meeting.
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