Why hasn’t anyone followed the batmobile or the batwing back to Wayne manor?
Because it is Silent and Black
It's too fast to keep up with, the Batcave's security system is top notch and mostly prevents people from seeing Wayne Manor anywhere near the Cave's entrances, and... well, Bat-luck, I suppose.
I imagine that Batman doesn’t return unless he knows no one is around, as far as he’s able to determine. I’ve always imagined he had a radar/scanning system of some sort.
What do you think?