This is a pretty universal thing in complex tasks. As you get used to things and your brain translates them into familiar patterns, they take less effort to anticipate (or produce,) so you can string lots of them together without being overwhelmed. Like when you see a piece of piano music that seems to be completely black from so many notes. Or when you watch olympic diving and wonder how a person is going to go from doing a perfectly still handstand 10m up, to launching into multiple flips and then somehow be calm enough by the bottom to think about not splashing at the end.

So you learn to recognize the set of signage you're expecting in a given pattern, and you recognize where the likely spots are for surprises, or you remember to watch for heads in the cars along the side so you know if someone's about to open a door.