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resulting in property damage frcm 12 to 4. and the value of property damage from $9,120 to $2,975.
The grooving was done chiefly to determine if it would reduce hydroplaning accidents on wet pavements.
During the 12 months prior to the grooving, 10 of the accidents occurred while it was raining, misting or snowing, and 6 while weather conditions were clear or only cloudy. In the next 12 months, 3 accidents happened during rain, mist or snow, and two when skies were clear.
In the "before” study period, both of the fatal accidents occurred on wet surfaces and involved skidding.
The engineer's said that wlille the accident reductions were
82.8%