I remember reading that China has one of the youngest road networks in the world, especially for highways etc.
I find myself wondering if that would equate to more consistent road signs, conventions etc - maybe that makes it easier for autonomy ?
Don't know enough to say one way or the other.
In the US and certainly in Texas there isn't even standardized road marking across the state, let alone the entire country.
I always remember the traffic circles in New Jersey, where "local custom" applies to right of way