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My guess is the issue with sensor fusion.

Radar throws a lot of false readings so there are many situations where it is ignored.

For examples, readings of stationary objects are mostly false.

My guess is that the speed difference was so big that also in this case Tesla decided that the radar reading was stationary and false.

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Hmm I think if a vehicle is moving even 5 mph it would be easily picked up by radar, and its only truly stationary things that are a radar "blind spot".

I suspect its a vision or fusion problem--as the article points out, the lighting wasn't great.

Why doesn't the car use ultrasound for AEB? Perhaps risk of false positives coupled with the fact that its range is so short it would only have time for limited braking anyway?

Stationary objects, also called obstacles. These systems can give people false sense of security and expectations, exactly at the wrong times. That kind of unreliability may be worse than having to drive and be attentive as a driver.

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