Here's one for you: https://www.fhwa.dot.gov/publications/research/operations/tft/chap5.pdf https://www.fhwa.dot.gov/publications/research/operations/tf... I s

Here's one for you: https://www.fhwa.dot.gov/publications/research/operations/tft/chap5.pdf https://www.fhwa.dot.gov/publications/research/operations/tf... I seem to remember a statistic that said, essentially, traffic waves propagate backwards at approximately 12mph. There are a set of circumstances where you can set up a "standing" wave of traffic where cars will have to tap their brakes at the same place for hours, for no reason.