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Basic Concepts <br /> Sensors can be hand -held or truck- mounted. Hand -held in- <br /> frared laser sensors are pointed at the pavement to get a pave- <br /> ment or surface temperature while your vehicle is stopped or <br /> moving slowly. <br /> Truck-mounted temperature sensors measure pavement or <br /> surface temperatures while your truck is moving. Ideally, ev- <br /> ery agency should own at least one truck- mounted unit. <br /> RWIS— www.rwis.dot.state.mn.us —is an Internet service <br /> provided by Mn /DOT and available to everyone. The RWIS is <br /> a predictive system that consists of a network of towers and <br /> temperature sensors embedded in state highways. <br /> If you do not have road sensors in your truck, look up the road <br /> temperature from the closest state highway on RWIS. This will <br /> give you an idea of the local road temperatures. <br /> DILUTION: THE CAUSE OF REFREEZE <br /> An ice control product will work until product dilution causes <br /> the freeze point of the brine to equal the pavement tempera- <br /> ture. At this point, the material will stop melting and you may <br /> experience refreeze if pavement temperatures are dropping. <br /> This process is Dilution of Solution. <br /> How long an application will last depends on five factors: <br /> pavement temperature, application rate, precipitation, begin- <br /> ning concentration, and chemical type. These factors explain <br /> why one application rate will not fit all storm events. <br /> 2 <br /> 53 <br />