That's emergent behavior (and that emergent behavior is the principle by which all balancing devices work). All it tries to do is keep the board level. Below a

That's emergent behavior (and that emergent behavior is the principle by which all balancing devices work). All it tries to do is keep the board level. Below a certain torque (which is inversely correlated to available wattage and speed) the board loses the ability to stay level. If overcurrent protection kicks in then the motor will abruptly turn off, usually resulting in a nosedive (because your center of gravity will be towards the nose of the board while speeding up). There are experienced riders who can ride pretty far beyond safe limits by balancing themselves, but that's incredibly dangerous.