And it keeps alternately speeding up and slowing down pretty significantly, just go ahead and pass it.

The reason they won't merge is because they can't tell if they have enough room, and they keep changing speed hoping that you will maintain speed.

But when you insist on matching their speed at all time for no damn reason, this.is why they do stupid drastic stuff like flooring the brake. And if you also floor the brake, you deserve it when they get out and punch you.
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http://img198.imageshack.us/img198/6457/rlonmaien.jpg http://i.imgur.com/7OKFr.jpg http://img846.imageshack.us/img846/8706/capturemo.png

So if there is a car signaling to merge in front of you

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