The driver of the car in view has accelerated hard past our vehicle, on our right-hand side, to race us for the gap to pass the truck. He has started to change lanes but never gave any signal. If we had been in a self-driving car and we were being badly tail-gated, what would the self-driving technology have done, and when? This strikes me as being a potentially complex scenario in which I could not trust a computer to inevitably get it right. (Photo taken from the passenger seat!) Eddie Wren.