Target tracking Research looks at effectiveness of FAST system

Fixed automated spray technology (FAST) systems are designed as a fi xed-asset technology for anti-icing at specifi c target areas, such as bridges, tunnels, ramps and other elevated roadways. They remotely sense the potential for frost or ice formation on pavement in light of atmospheric and pavement data from a road weather information system (RWIS) or an environmental sensor system (ESS) and apply chemical freezing-point depressant in a timely manner. FAST systems have emerged as an important way to supplement mobile winter-maintenance operations by enabling winter-maintenance personnel to treat selected locations before snow and ice problems arise. A recent study by the Western Transportation Institute determined the cost effectiveness of all the existing FAST systems for the Colorado Department of Transportation (CDOT). Components of the study included a literature review, a national survey, a CDOT survey and a safety analysis. The literature review revealed considerable knowledge of and experience with FAST systems. Documented experience with FAST systems in North America and Europe has revealed a mixed picture. On the one hand, several studies have indicated reductions in mobile-operations costs and signifi cant reductions in crash frequency, resulting in favorable benefi t-cost ratios. On the other hand, there has been a variety of problems related to activation, system maintenance and training. Recently the application of FAST systems has increased in North America. Installing a FAST system is complex, and the challenges are often site-specifi c. Diffi culties can be expected during operations, particularly in areas related to software, activation processes WINTER MAINTENANCE