Its a turn signal. I expect its presence in your car is something of a mystery to you.

Anyway, when there are four car lengths ahead of you, and i turn mine on, it is to signal my intention to occupy one of those empty spots.

It is not your signal to finally decide to stop farding and put the metal down and close up that gap.

Anyway did you notice how me and my $400 truck just kept coming, and you had to slam on the brakes in your new cts to keep it out of my ass, honking the whole time? Only takes a tiny bit of courtesy to avoid all that drama. Of course, courtesy is as foreign to you, no doubt, as your turn signal.