Whenever a forensic crash investigation has not been completed — something which typically takes many days — it is very unwise for anyone at a crash scene to speculate about the cause of the incident. It is not rare for things that look obvious to prove entirely inaccurate.
Even on the fringes of road safety, most people now understand that we should use the word ‘crashes’, not accidents, but there are many other important topics where there is still confusion and inaccuracy. This includes the proportion of crashes that are — quote — ’caused’ by driver error, or less accurately, human error.
Almost certainly driver error but for example it could have been due to a brake failure or even a medical emergency such as a heart attack. (Wikimedia Commons)