There are clear guidelines regarding the size and placement of hoardings on roadsides but these are observed more in breach than in practice. The traffic rules also do not permit any distraction for a driver's eye in the zone of acute vision, a 30 cone from the eye to 50 metres away. The mind takes cognisance of any distraction, visual or otherwise in this zone. But in reality this is not possible. In easy driving conditions, absentmindedness is probably the greatest danger.
Hoardings aggravate the situation and add to the hazards.