Re: I'm not sure I understand @AMBxx
Absolutely avoidable. And in court, the phrase unavoidable accident would have been used by the pedestrian or their next of kin as a way to shift liability to the driver.
Black ice is created under specific circumstances that can easily be discerned by checking the weather report or a couple of weather sensors. Knowing that, you slow down, increase following distance, and be well-versed in steering into the skid. Of course it might not always work, but you can decrease the chances of being caught out and crashing if you are prepared.
And yes, even the most attentive driver is going to lapse or otherwise take the wrong moment to check their mirrors and find bad things coming at speed when they get back to the road. But it's pretty telling when most insurance statistics show there are repeat offenders, be it due to excessive speeding, repeated instances of inattention, or just bad at driving. Most insurers (in the US) don't even ding you for the first accident anymore if it's been a long time since your last one. And since revoking a license or being uninsurable doesn't stop people from driving, it's safe to say that the best solution is to remove the mouth-breathing meat bag from behind the wheel. Self-driving cars are one way to do this.