I was under the assumption that "the driver's momentum was around 67.000 kg*m/s" in the top parent comment meant we were talking about a human confined within a

I was under the assumption that "the driver's momentum was around 67.000 kg*m/s" in the top parent comment meant we were talking about a human confined within a car. This is also supported by how @butwhywhyoh says " then you compare it to an impact without describing exactly what you're comparing" in which @trgn still doesn't say clarify what sort of comparison he's making. It's an argument against using some irrelevant momentum number in a comment. Without showing this momentum number, their comment is just "I'd say it's gross negligence to drive that fast at all on any surface street with sidewalks, traffic lights, intersections, stores, whether the driver is asleep at the wheel or not, autopilot or not, drugged or not" which certainly wouldn't get as much engagement on HN.