I found this video clip fascinating. It's a traffic camera recording of a buckled road in Minnesota. Watch how some attentive drivers see it in time to slow down; their caution warns those behind them, so that strings of traffic form as a number of cars slow down (in the fast lane) to negotiate the obstacle. Other cars' drivers are clearly looking further ahead, and don't even notice what is effectively a speed-bump in the road ahead of them. Their cars are launched into the air, and land with teeth-rattling thumps.
I wouldn't have liked to be on that road at that time. Things had the potential to get rather too interesting for comfort!