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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 />• <br />• <br />• <br />