A driver's duty of care requires controlling speed and direction so as to know what is happening in the vicinity of the vehicle in time to take reasonable steps to react, but the range of reasonable responses must be assessed in the context of the dynamics confronting the driver, not by hindsight reasoning focused solely on whether the driver could have stopped in time. Walking along the middle of a roadway without regard for oncoming traffic demonstrates a high level of failure to have regard to personal safety warranting a major apportionment of contributory negligence. There is no principle of law requiring a driver to be able to stop within the area illuminated by headlights.
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