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I am not sure that this IS a game of chicken. Rather, it was a serious misjudgment by the boys involved. Its hard to tell, but it looks as if the HGV was going at a fair lick and I think it is incredible that he didn't hit the boy with more force. My sympathies still lie with the driver though. If I had been behind the wheel, it would have been me that ended up in the Hospital, with heart failure !
When I was working up in Town 25 years ago, I met a Tube train driver, that was involved with a suicide in front of his train, and he told me that it was 4 weeks before he could return to work afterwards.