Precise Read-back
Using -R, -L suffix is no guarantee.
Years ago, flying into a very busy gen. av. airport in S. Florida, with a lot of static and congestion on frequency, I believe I was cleared for a vis. app.
to -R runway. I read back "-R runway" at least 5 times, assuming controller would correct me if I'd got it wrong. He was overloaded and it just didn't register. Finally he said: "Where are you; I just don't see you?"
"I'm on short final, -R runway, clear of traffic."
"-R runway? You're supposed to be on -L runway!"
" I read back -R runway at least 5 times."
"Oh well. Cleared to land."
Lesson learned: Eternal vigilance. No assumptions.