2012-07-25 CC Packet - Laserfiche WebLink

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m n m G Before the Storm ANTI -ICING Anti-icing is often the most cost - effective and environmental- ly safe practice in certain winter road maintenance situations. You should consider heading in this direction. Anti- icing —a proactive approach— should be first in a series of strategies for most winter storms. By applying chemical _ freezing - point- depressant materials before a storm, you can prevent snow and ice from bonding to the pavement. Anti-icing requires about / the material of deicing at 'Ao the overall cost, making it the least expensive option for improv- ing traffic safety. Anti-icing is effective and cost - efficient when used correctly and approached with realistic expectations. 3 Guidelines for anti-icing nes • Anti -icing is often effective for heavy frosts. • Anti-icing works best when combined with accurate road Anti can weather information. reduce airborne • Early application is particularly important for frost or light dust and salt freezing drizzle. particulates. • Liquids are the most efficient and may be applied days in advance of an event. • Pretreated salts will work at lower applications (lowest . possible setting, less than 100 lbs/two-lane mile) closer to c the expected event. • See the Application Rate Guidelines on page 16 of this field handbook. o d What to do n in 0 d • Apply only with stream nozzles to maintain some bare o a pavement between sprayed areas to reduce slipperiness. Fan spray is not recommended. • Schedule applications on bridge decks and critical areas if a temperature and conditions could produce frost or black ice. • Consider spot - applications on hills, curves, and intersec- W tions if predicted conditions warrant. • Use appropriate chemical for your pavement temperature range. See the chart on page 19 of this field handbook. 5 a 56