OK. Time for a rant.  It seems to be a common belief that turn signals give you the right to do whatever it is you were signalling to do.  This simply is not the case.  The fact is your turn signal only indicates your intention to turn or change lanes or whatever.  If someone chooses not to let you in, that is their prerogative.

I make a habit of signalling well before what I intend to do.  We would all be a lot safer on the road if we were just a little bit more deliberate in our driving habits.