Around here they have big signs at the top and bottom of some ramps that say “KEEP MOVING”, and you’d be surprised as to how many drooling window lickers still stop.
I'm sure you won't be surprised at how many right lane drivers appear to be determined to prevent that guy in the onramp from merging. Approaching an onramp I try to move over one lane to allow a merge, if conditions permit. I used to give the oncomers a headlight blink or two (OK, I see you) until a couple of times the right-laner behind me sped up to prevent the merge.