How often do these narrow-lane scenarios require one of the cars to back up? And do any self-driving cars perform this back-up negotiation maneuver? Here's an

How often do these narrow-lane scenarios require one of the cars to back up? And do any self-driving cars perform this back-up negotiation maneuver? Here's an example of a non-autonomous car backing up for a FSD Tesla: (at 22:20) https://www.youtube.com/watch?v=2l6KLC3S5gc&t=22m14s https://www.youtube.com/watch?v=2l6KLC3S5gc&t=22m14s