this is incomplete, and merely describes a problem set. Researchers showed that it only takes one set of brake lights to mess up the flow of traffic, and the re

this is incomplete, and merely describes a problem set. Researchers showed that it only takes one set of brake lights to mess up the flow of traffic, and the resulting obstruction will move backward from the point it started at about ~20MPH (iirc, may have been 10mph). when you're driving before traffic starts and you see someone merge and step on their brakes, making the person behind them step on their brakes, you've just witnessed the beginning of "rush hour traffic" - that will propagate backward and cause rippling slowdowns for over an hour. Hit "save recording" on your dashcam, because that person is 100% today's proximal cause.