The pictured car being a Tesla, how much autonomous equipment do they have that could have developed fault
Even a correctly maintained car can develop an unexpected fault. Most of the time it doesn't have serious consequences, but every so often everything lines up and it results in an incident with more serious consequences.
I work in a high hazard industry (not railways) and have been in engineering 50 years, and over that time I have heard "That cant happen" too many times, and on occassions it has happened. To be fair the majority of incidents do have a human factors component, but every so often something happens that no one could have foreseen or avoided.
At least from the NYMR perspective there doesn't seem to be any shortfall, as evidenced by the post #36, the RAIB will not be investigating further.
It also worth remembering that people make mistakes, there does seem to be a tendancy to try and 'pin the blame' these days, probably to do with insurance claims, but unless someone is negligent I am not sure if it serves a purpose, better to look at how you can avoid a repetition, as human error is usually one of several factors in any incident. It also worth noting that when we are reviewing human factors even with the best guidance and clear indications we have to assume that 1 in 100 times the human will not carry out the operation correctly, maybe conservative, but humans are falliable. Our gold standard is to have a system which is passively safe, i.e. cannot physically get into a hazardous condition barring major external events that are unforeseeable. Obviously with cars, railways etc this is not acheivable.