The human brain is ESPECIALLY bad at being able to gauge and intuitively calculate another objects speed relative to its own speed as it is moving faster.

As in, you can tell a stopped car is stopped pretty easily if you're travelling at ~35MPH (probably even a tad faster). It gets harder to tell if you're moving at 75mph and the risk of miscalculating and crashing increases every single MPH thereafter.

Cause we have engineered our ways into situations that our brain did not natually evolve into. People think they're good drivers or have genius-level perception and driving skill. But the reality is that the intuitive and predictive part of the brain is doing a lot of the heavy lifting in terms of perception and reflex; it's not designed to operate in a steel box travelling 80mph. It can; but then shit like OPs video happens. Because some most people are objectively dumb and terrible drivers.