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Have you ever been in stop-and-go traffic moving at a snail’s pace and then all of a sudden you’re driving normally at full speed but there wasn’t an accident, a stalled car, construction work nor any other evident reason for causing the back-up? We call this immaculate congestion! It’s a play on words of an immaculate conception.
Check out my related post from 19 November 2008 : Idioms & Slang : Rubbernecking