I think the difference between Tesla and Audis new system is number of sensors used, possibly the power of computing unit and use of AI in audi.
I understand Tesla uses 1x radar, camera ( not sure if just one or several) ultrasonic sensors and GPS.
Audis latest tech includes, 5 radars, laser scanner ( I think 1st for series production car), 5 cameras, ultrasonic sensors and GPS. All of that data need huge computing power.
AI is allegedly used which means it learns itself so does not need to pre-programmed with a solution for every possible situation, I guess this happens on test vehicles that gather data rather than customer cars and than the resulting software is used in production cars. On one side it is great on the other you don't ever really know for 100% what the car will do because software has learnt itself and was not pre-programmed.
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Why the 37mph limit on the D5 I wonder?
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If you wonder why odd number than it's because Germans do it in km/h and 37mph is ~60km/h. I guess it could be limited by how fast processing unit can handle input from all those sensors.