What do you think the chance are that the average cager is aware of whether the road continues on in front of them? Especially if they are intending to turn anyway? The best use of turn signals is to lull traffic in the next lane into thinking you intend not to change into their lane. Otherwise, they will speed up and try to block your move. The best way to do this is either put on the wrong signal or leave the correct one on for several miles to make them think you just forgot to shut it off.
