THE ORDER: Which Roads are Cleared First during Winter Weather Thursday, December 16, 2010

RALEIGH — Interstates, four-lane primary roads and other routes considered to be essential to the movement of intrastate traffic, are top priorities when it comes to winter weather treatment.

The state is divided up into 14 divisions. Officials from each division evaluate roads and prioritize anti-icing and de-icing.

If the temperature is around 32 degrees and frozen precipitation is in the forecast, NCDOT pretreats its roads. The decision to pretreat roads is made 24 to 48 hours in advance of a winter storm.

NCDOT typically uses salt brine, a solution of water and salt, to treat its roads. Salt brine is a cost-effective way to keep roads safe, costing about 13 cents per gallon to manufacture.

Salt brine can only be applied to the road when it is not raining because the moisture will dilute the solution and wash it off the road.

Salt brine can used to pretreat roads in temperatures as low as 18 degrees.

For the latest road and weather updates, visit NCDOT’s Traffic Management Information System (TIMS), follow us on Twitter, "like" us on Facebook, call 511 or use NCDOT Mobile by typing "" into your smartphone browser.


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