@geoffwnz:
Rikkitic:
My comment was a request for clarification. I asked because I don't understand the issue, having not experienced it myself. From the tone of your response, I would not say it has nothing to do with impatience. Maybe that and a touch of driver arrogance.
It causes a concertina effect. One person lifts slightly, the one following lifts more, the one following that has to tap the brakes, the next one needs to brake harder. Within about 20 cars, the traffic more or less comes to an abrupt halt. When those cars pass the spot, there is nothing to see.
QFT.
One slow car merging can cause a traffic jam for a couple of kilometres before the ramp.