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When are stop signs present?
At every intersection
When visibility is restricted
Only at busy intersections
At pedestrian crossings
The correct answer is: When visibility is restricted
Stop signs are present when visibility is restricted, for example at an intersection or where there are obstructions that prevent drivers from seeing oncoming traffic. Option A is incorrect because not every intersection has a stop sign. Option C is incorrect because stop signs may be present at quiet intersections where visibility is poor. Option D is incorrect because not all pedestrian crossings have stop signs, only those where visibility is restricted or there is high pedestrian traffic.