Why don't bikes falls while in motion?

The video explain why we bikes don't fall when on motion, but once we stop, it becomes extremely difficult to balance it.

[kartickmanna]

Get ready to go Switzerland to collect Nobel prize

[anirudhparvathareddy]

Why is it not due to inertia of direction bcoz net external force acting on bicycle+man sys Is o

[calvinhulburt]

The logic is like, Since bullshit, ergo more bullshit. The failure of this concept is that it looks for a neat system of moments to hold the bike up but can't deliver. The bike stays upright because it moves laterally instead of falling over.

[vichofernandez]

not frying to h8 but this is simply wrong