Crossword puzzle clue "they tell you how to fix things"

They tell you how to fix things

Street corner things that tell you you can't park here, if you should stop, where to go, etc.

They might tell you where you are

Place to find things you like and things you don't

Things that tell you when to get busy?

"There are some things you should just never tell another person," briefly

Question when you can't tell two things apart

They know things you don't think they know