I want to place road labels only near the map edges, and where roads intersect - as depicted by the red X's in the image.
Background: I've seen the military do that in their topo maps, and I think it's a very efficient and clean way of labelling roads (these will be the 'shield-like' symbols with the route number in them) - maybe it's possible by using some kind of expression that detects the intersections between roads and map edges?