Dear idiot in the right lane on the highway,
When a car is trying to merge, please continue at the speed that you are going. It is the responsibility of the merging car to avoid you. When the merging car slows down to yield the right of way to you as is required, please do not slow down to match the speed of the merging car to prevent them from merging without coming to a complete stop. Though you may be trying to be "nice", you're really just making it a lot more difficult for everyone.
Trying to merge at the speed of traffic flow