I ride the bus from home to school and vice versa approximately 3-4 times per week for an hour each time. The bus is either bi- or tri-articulated, and it can accelerate to speeds up to 80km/h.
Most of the times the bus seats are taken and the space I have for me and my backpack is 70cmx70cm. The design of the bus has multiple tubes on the roof to hold on to and your body is always either facing a chair and window (never a wall) or facing forward.
My question is, is there a standing position that is ideal to stabilize your body and not fall when the bus decelerates? I'm thinking that maybe being parallel to the side of the bus with the backpack on your chest and knees slightly bent while holding with one hand the bar is the best position. What are your thoughts?