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Page 5 · column 4 of 9 · from the scan, no model involved
areas. On bare pavement routes, the first operations, performed almost concurrently, are the application of abrasives to such trouble spots as hills, curves, intersections, ramps, and bridges, and the application of sodium chloride and calcium chloride to pavement1 as soon as there is sufficient ice or snow to retain them.' Plowing begins when snow i reaches one or two inches. Other routes are kept passable with abrasives and plowing.
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