[Reason077]

False positives are one of the more difficult problems in collision avoidance. Small pieces of metallic debris on the road surface (for example) can throw off a huge radar signature that looks like something that you really wouldn't want to hit.

Many automatic emergency braking implementations disable at high speeds, and/or ignore stationary objects, for this reason.

I get the impression that Tesla has made their automatic braking a bit more aggressive in recent updates, given recent publicity about cars hitting fixed objects while on autopilot.