I'd be concerned about the increased accident potential of having a string of cars whose drivers are busy texting, reading the newspaper, napping, etc. and not paying attention to the road. Then if another car drifts into their lane, they wouldn't be paying enough attention to try to dodge it. Also a road train hitting a patch of black ice ought to prove interesting or when driving in heavy rain where the heavy lead truck has no problems, but the car further back in line with worn out tires starts hydroplaning. A deer slamming into the 2nd vehicle in line...I can envison all sort of traffic/weather scenarios where the road train could quickly turn into a multicar collision.
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