Majority if the cars are going to Madrid, but some are going to the neighbouring towns north. I was going to Santiago (i know, far) with sign saying "A-6, Santiago, A Coruña" next time I would probably just use Ávila or some closer point.

Best place to A Coruña <3

Better than it looks like. Is perfect when there are some traffic jam because you can ask for the people who stop before enter the roundabout. Direction A Coruña.