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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Synthesis of Visibility Detection Systems</title>
      <link>https://trid.trb.org/View/1224032</link>
      <description><![CDATA[Visibility is a critical component to the task of driving on all types of roads. The visibility detection and warning systems provide real-time, automated detection as well as appropriate responses to counteract reduced visibility conditions due to fog, heavy rain, snow, smoke, dust or haze by informing drivers of present conditions and lowering the speed limits to match the reduced visibility condition. The objective of this research project is to provide a synthesis of visibility detection systems and traffic control techniques that are developed and/or implemented in the United States and around the world. This report provides an overview of the best practices of fixed visibility systems at areas of recurrent dense fog and mobile systems for seasonal visibility reduction for areas of predicted seasonal fog or smoke from wildfires. Ongoing research efforts of developing new camera-based visibility detection systems are also discussed. In addition, a preliminary analysis of Fog/Smoke (FS) crashes in Florida, including detailed two-way analysis capturing interactions between various factors and fog and/or smoke related crashes is provided in this report. To identify and prioritize areas for treatment, an update of the statewide map with increased granularity of reduced visibility related crashes is generated. The visibility detection systems can help to mitigate the increased hazard of limited-visibility, however, such systems are not widely implemented and many locations with no systems are experiencing considerable number of fatal crashes due to reduction in visibility caused by fog and inclement weather. On the other hand, airports' weather stations continuously monitor all climate parameters in real-time, the gathered data may be utilized to mitigate the increased risk for the adjacent roadways. An additional research effort is also provided to examine primarily the possibility of using weather information collected by weather stations at airports within the vicinity of fog-prone areas. Bayesian logistic regression was utilized to link 6-year (2005-2010) of historical crash data to real-time weather information collected from 8 airports in the State of Florida, roadway characteristics and aggregate traffic parameters. The results from this research depicts that real-time weather data collected from adjacent airports may be good predictors to assess increased risk on highways.]]></description>
      <pubDate>Thu, 13 Dec 2012 09:26:16 GMT</pubDate>
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      <title>Minnesota Local Road Research Board investigation 842: best practices for dust control on aggregate roads</title>
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      <description><![CDATA[This study evaluated the performance and cost of commonly used dust palliatives using a mobile air sampling technique.  Treatments of calcium chloride, magnesium chloride, and organic polymer-plus-binder were evaluated at standard application rates during the first year and at variable rates during the second year.  The treatments were applied to a variety of subject roads that were located throughout Minnesota.  Average daily traffic levels varied from 25 to 700 vehicles per day.  The overall data trend showed that treatments reduced dust levels and measurements showed that aggregate surface moisture content was the best predictor of dust control efficiency.  Positive relationships were measured between dust control efficiency and other variables in the study, generally reinforcing the concept that higher application rates may be more successful on gravels containing greater amounts of material passing the number 200 sieve.  A negative relationship was measured between dust control efficiency and sand equivalency, showing that treatments on gravels containing more sand material were less effective.  In addition to dust control, study participants observed a secondary benefit of surface stabilization, which lasted for a period of time.  Treated sections that developed surface stabilization were able to reduce maintenance activities to intersection areas only.]]></description>
      <pubDate>Wed, 22 Aug 2012 16:21:04 GMT</pubDate>
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      <title>Best Practices for Dust Control on Aggregate Roads</title>
      <link>https://trid.trb.org/View/898980</link>
      <description><![CDATA[This study evaluated the performance and cost of commonly used dust palliatives using a mobile air sampling technique. Treatments of calcium chloride, magnesium chloride, and organic polymer-plus-binder were evaluated at standard application rates during the first year and at variable rates during the second year. The treatments were applied to a variety of subject roads that were located throughout Minnesota. Average daily traffic levels varied from 25 to 700 vehicles per day. The overall data trend showed that treatments reduced dust levels and measurements showed that aggregate surface moisture content was the best predictor of dust control efficiency. Positive relationships were measured between dust control efficiency and other variables in the study, generally reinforcing the concept that higher application rates may be more successful on gravels containing greater amounts of material passing the #200 sieve. A negative relationship was measured between dust control efficiency and sand equivalency, showing that treatments on gravels containing more sand material were less effective. In addition to dust control, study participants observed a secondary benefit of surface stabilization, which lasted for a period of time. Treated sections that developed surface stabilization were able to reduce maintenance activities to intersection areas only.]]></description>
      <pubDate>Thu, 20 Aug 2009 08:57:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/898980</guid>
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      <title>DUST CONTROL FOR UNPAVED ROADS</title>
      <link>https://trid.trb.org/View/753770</link>
      <description><![CDATA[This best practice describes the use of dust suppressants to control dust on unpaved roads in Canada.  It discusses potential environmental impacts, limitations and expected performance of a variety of dust suppressants.  It investigates the suppressants that are most commonly used, and it discusses the conditions under which each one is most effective or not effective.  Some factors which influence the effectiveness of dust suppressants are regional climate, fines content, daily traffic loads, and type of aggregate utilized.]]></description>
      <pubDate>Tue, 29 Mar 2005 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/753770</guid>
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