The principle in Manley v Alexander [2005] HCA 79 at [12] — that a driver must control speed and direction so as to know what is happening in the vicinity in time to react — does not impose a standard of perfection or require a driver to slow to a speed that would enable avoidance of any unseen hazard. The words 'may know' mean 'is in a reasonable position to know', which is itself a standard of reasonable skill and care. A driver is not negligent merely because, with hindsight, a slower speed would have avoided the collision, where there was no particular reason to expect a pedestrian on the road at that time and place.
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