Not really - it's about the surface area of the interface. It's pretty easy to know if a car will work on a road - it needs tires and the ability to control it'

Not really - it's about the surface area of the interface. It's pretty easy to know if a car will work on a road - it needs tires and the ability to control it's own movement. But if the road had thousands of different connections to the car, there certainly would need to be testing for each manufacturer.