(centrally, though, in the state of new york) :
-is swerving technically illegal?
i know it's certainly cause to be pulled over, as it is illegal to drive drunk or recklessly, but is crossing over a yellow line actually illegal in itself, if for a brief moment?
-cops tailgating: what is the legality in that?
-what exactly is a "warning?"
is it just a verbal, "don't do this again" type deal?
or is it entered in the computer: "they've been warned" etc