Where a single vehicle runs off a road in the absence of evidence of mechanical defect, tyre damage, animals, or objects on the road, the movement of the vehicle is evidence of driver negligence on the res ipsa loquitur principle and is not, per se, evidence of negligence by those responsible for road maintenance. A trial judge's finding that a driver was paying attention but misled by road conditions will be reversed on appeal where it is inconsistent with incontrovertible physical and expert evidence about the driver's speed and the time available for the events found to have occurred.
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