That's what it's like for me driving to work too. Every freaking day I have someone who wants to merge into my lane with me in it. I don't think people know how to use their damn mirrors. All it takes is a good look in the mirror, make sure that your blindspots are clear, USE YOUR TURN SIGNAL and then merge.
(This is my biggest pet peeve. I nearly get into an accident at least once a week because some asshat can't take the time to look before they merge. I go the speed limit since I can't get any more speeding tickets and I leave ample room in front of me and still there is someone who wants to be RIGHT WHERE I AM!)
So today, I had someone decide they wanted to be in the same space as me. Just sort of meandered over, didn't look, didn't signal and didn't hear the honk of the horn either. Oh well, at least one of us was awake.