This was the first thing I too thought when reading the thread title. Highway to Hell too, but especially Back in Black. There's always a seemingly deliberate build-up or closure in his choice of crash.Listen to Phil Rudd throughout the entire Back in Black album for a master class on which song parts merit which cymbal treatment.
Like so many things drum-related the answer is in the music.
In this song, I can hear those deliberate hits (0:48), as well as more random moments where it doesn't matter as much, I presume (1:46).