>>idiots who think an on-ramp is their personal invitation to cut-in.<<
Actually, it is. The whole idea of merging traffic is that both sides cooperate with each other. I compare it to a zipper.
In theory, that is perfectly correct. Unfortunately, zippers don't have independent unpredictable brains on each half of the device.
I often marvel at how too many drivers actually passed their driving test (in California, assuming they ever took one.)
Big bump