Of course there's a reason for the traffic jam, but people make it far far worse by tailgating. I saw some fantastic traffic jams in China. There'd be some inc

Of course there's a reason for the traffic jam, but people make it far far worse by tailgating. I saw some fantastic traffic jams in China. There'd be some incident on a highway (not the toll highways, but the badly supervised free ones between nearby cities). People would drive on the wrong side of the road to get around it; on both sides. Eventually, there'd be thousands of cars backed up, on both sides of the road, unable to move more than a few feet. It was good news for the nearby shopkeepers, who'd have people leaving their cars to get something for dinner (since they couldn't move anywhere) - this did cause some issues when the traffic started moving again though. But yes, originally a truck had broken down under an overpass or something, so arguably that was why it all started.