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Why exactly does a truck driver need to see the car behind him? I have always wonders that. "If you can't see my mirrors I can't see you." What is he going to stop and start backing up on the interstate? I've been far enough back so they can easily see me and they still drive side by side in the passing lane for 5 miles, seems like most could care less what's behind them.
Also with close following wouldn't the impact in a sudden stop actually be less forceful the closer you are? If you actually got up and rested your bumper on his there would be no impact at all, the brakes of the semi would just start slowing you down at the same rate, so if you were really close the truck actually wouldn't have slowed down very much in a panic stop resulting in just a bump at a few mph. If you are sitting back the recommend distance the car in front can almost make a full stop and if you aren't paying attention you hit them at full highway speed.
Just food for thought, I hope someday electronics allow all cars and trucks the ability to move along in high speed trains bumper to bumper.
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