I drive home from work through the capitol of my state on an elevated cloverleaf freeway every day. There is one part of this massively huge elevated freeway that crosses over 10 busy freeway lanes below. As I was crawling along in this bumper to bumper traffic jam at quitting time, my car was at a standstill way up high in the air next to this big truck and trailer rig. We were at a slant up in the air and I could feel this freeway in the sky start to tremble. I'm looking down from God knows how high and this truck starts to release and then reset his air brakes and that makes the road tremble even more. It's also windy as hell and this whole concrete structure is actually swaying with the weight of all these cars on it.