How to describe the figure-of-eight bridge in the old saying

The current explanation means that they are very close to each other, often inadvertently learning each other's information, but they don't know each other and don't exchange information. Both sides still live their own lives like strangers.

Lao Tzu uses the action of "going back and forth" here to refer to war and friction. His original intention is: even if the people of the two countries get along very closely and communicate very closely, even the barking of chickens and dogs are mixed together, there will never be a war (this is the truly ideal relationship between countries and people! )