Other premium automakers have automatic braking and pre-collision systems that take effect regardless of whether the (enhanced) cruise control is engaged.

We have seen from other incidents that Tesla's autobraking will not engage when autopilot is disabled (potentially by tapping the brakes), which is contrary to widespread user expectation -- disclaimers notwithstanding.

However, in this particular case, it was the obstruction detection that failed. Based on their blog post disclaimer, it appears to be a visual sensing system; eye-height radar-based system used by most other manufacturers would have correctly detected the obstruction.

Is there an industry standard (yet) for the efficacy and behavior that these systems must meet?