On a one-way road, how many warning devices must be installed to warn other road users that, due to a breakdown of their vehicle, it has been immobilized on the road ?
A single device placed behind the vehicle at least 50 meters away and in such a way that they are visible from at least 100 meters by oncoming drivers .
One in front and one behind the vehicle and at a minimum distance of 50 meters and visible from at least 100 meters .
A single device positioned behind the vehicle at least 100 meters away .
Correct answer :a
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