Why suspend vehicles from the guideway rather than supporting from below like train tracks?
Vehicles suspended from tracks allow the vehicle to move naturally around turns which causes less stress on the vehicle, the guideway, and the passenger. This is similar to how motorcycles and airplanes bank during turns. Another reason is that this design allows a narrower guidway which makes construction cheaper and causes less aerodynamic disturbance (which can lower efficiency). Also, because the guideway can be closed on top, no objects or debris can sit on the track in the way of the vehicle.