Blinkers are a simple concept. Flick the wand upwards, right blinker goes on. Push the wand down, left blinker goes on. Slight pressure the opposite way and it turns off. Easy enough, right?
Well, not for some!
Unused directionals are the most annoying thing to encounter while driving, not to mention extremely dangerous! It may seem obvious to the driver that their lane is ending and they need to merge, but the person in the next lane behind you may not see this. The simple switch of the blinker is a kind way to warn them that you are merging over.
Personally, I know when a driver puts on their blinker in any situation, I am more likely to slow down to let them over. I think most would agree that they are less considerate to people who appear to be cutting them off, often times purposely not letting them over which in the end can lead to accidents and road rage.
So follow the golden rule:
Use blinkers for others, as you would want blinkers used for you!