I am scare to take bumpy car ride as car suspension is broken. And pregnant mummy advise to sit at back because of the air bag. If u sit at front seat, push the chair to all the way back. I wear seatbelts at the back too and also hold the upper handle for support during bumps. When taking bus, try not to sit at last row middle portion where there’s nothing to hold. I sit at mostly reverse positions or where I can hold the back of front seat.