All other finds from Spain have at least five. The shape of the boulders is peculiar and unlike any other. And they are the only finds where a boulder rests on the ground. This Ribadavia sign differs from any other sign in Spain. It was on a newly paved road and let's hope signals a new trend.
All boulders are still in the air, but gravel accumulates already on the road.
The other Spanish traffic rocks come in two flavours. The stone ready to hit the road is flat. The second group is designed to suggest a real menace to the innocent driver. The sign carries more, but smaller, stones. In reality only six or seven boulders are loose.