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If you go in F2 mode and scroll left a few till you get the view watching the driver steers, front windscreen etc, from a passenger persepctive, you will notice if you look at the chair the driver is on, when he breaks, it will bounce up and down a bit. This is a air-seat (or similar word) and most buses have them. Why don't passengers? Because drivers sit on them for 5 hours a shift, then maybe another 5 after that...so at least them give them some relax on pothole roads!