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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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    <item>
      <title>USE OF PAVEMENT CONDITION DATA IN HIGHWAY PLANNING AND ROAD LIFE STUDIES</title>
      <link>https://trid.trb.org/View/104763</link>
      <description><![CDATA[ROAD LIFE STUDIES ARE ACTUALLY HIGHWAY SERVICE AND INVESTMENT STUDIES, AS THEY INVESTIGATE ANNUAL COSTS AS WELL AS HOW LONG VARIOUS ROADWAY SURFACES LAST. DETAILED CONSTRUCTION, MAINTENANCE, OPERATION AND HIGHWAY CONDITION INFORMATION IS BEING OBTAINED THROUGH USE OF THE CONTROL SECTION CONCEPT. PAVEMENT CONDITION DATA IS VITAL TO THE STUDY FOR IT IS USED TO FORECAST FUTURE CONSTRUCTION AND MAINTENANCE NEEDS AND COSTS, AS WELL AS TO DETERMINE WHETHER A PAVEMENT WAS RETIRED DUE TO OBSOLESCENCE OR BECAUSE OF STRUCTURAL DETERIORATION, AND IF THE LATTER WHETHER THE CAUSE WAS SURFACE, BASE OR SUBGRADE FAILURE. CURVES HAVE BEEN DEVELOPED SHOWING AVERAGE PAVEMENT LIFE EXPECTANCY. THE PRESENT SERVICEABILITY INDEX /PSI/, TRAFFIC DATA, AND PAVEMENT EVALUATION BY MEANS OF THE CHLOE PROFILOMETER ARE BEING STUDIED IN AN ATTEMPT TO IMPROVE PREDICTIONS OF FUTURE NEEDS AND OF THE SERVICE LIVES OF PAVEMENTS.]]></description>
      <pubDate>Wed, 09 Feb 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/104763</guid>
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      <title>SOIL CONSIDERATIONS IN SITING HIGHWAYS, AIRPORTS, AND UTILITY CORRIDORS</title>
      <link>https://trid.trb.org/View/152048</link>
      <description><![CDATA[This is a review of sources of soils data used to identify soil properties that influence the location, design and performance of transportation systems and utility corridors. The use an value of soil surveys and other sources of soils data in planning these systems and corridors are also discussed.  Soil surveys and geologic surveys which supplement one another are outlined.  Interpretation of aerial photographs have been extensively used to identify surface features, including soil properties of importance in planning transportation systems.  Engineering soil surveys are generally conducted after a corridor or preliminary location for a route has been established.  Highway test data (sampling and testing of soils at intervals along the route) provide a vast amount of soil information and have been organized by some States to aid in planning transportation systems.  One such State, South Dakota, found, on statistical study of the data that each soil had a distincitive range in test results.  The kinds of soil information of most value in transportation planning are discussed and include: composition, erodibility, chemistry, moisture regime, depth, density, slope and kinds of geologic formation.  The actual use of soil surveys in planning transportation systems (in route selection, planning for more detailed study, planning drainage requirements, planning erosion control, recognizing excavation and grading problems, locating sources of sand and gravel for subbase, selecting possible chemical stabilizers for fine-grained soils, locating sources of topsoil, locating rest areas, and planning secondary roads, streets and parking lots is discussed.  The use of soil surveys in planning utility corridors and the cost and other savings resulting from the use of soil surveys are also discussed.]]></description>
      <pubDate>Wed, 08 Oct 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/152048</guid>
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      <title>ASPHALT WITH IMPROVED SKID RESISTANCE</title>
      <link>https://trid.trb.org/View/34667</link>
      <description><![CDATA[In an effort to produce surfaces with increased skid resistance, 4 test sections each 7 m wide x 45 m long x 25 mm deep - were laid together with 100 tonnes of size 10 "control" asphalt and two (one coarser than the other) basic experimental asphalts.  The principal constituent of the aggregate was a vesicular newer basalt having a high resistence to polishing (PSV-50).  The control asphalt was designed to have a typical size 10 dense grading and binder content which would render an air void content of approximately 4 percent.  The density, skid resistance, surface texture and drainage characteristics of the experimental and control asphalts were monitored (results are tabulated).  On the basis of this study, it is concluded that the use of an open aggregate grading and viscous binder produces asphalt having a satisfactory surface texture which will not close up under action of traffic.  Such a texture promotes skid resistance of the pavement surface.]]></description>
      <pubDate>Wed, 13 Aug 1975 00:00:00 GMT</pubDate>
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      <title>EVALUATION OF THE NEW VIRGINIA DEPARTMENT OF HIGHWAYS AND TRANSPORTATION SKID TESTING TRAILER</title>
      <link>https://trid.trb.org/View/34659</link>
      <description><![CDATA[In an effort to evaluate a new skid trailer and to determine how the survey skid testing program should be conducted in light of findings, a study was made of the trailer's testing precision; operational error (defined as unexplained day-to-day variation); the speed-skid number relationships obtained for some customary surface types used in Virginia; and the relationship to the skid trailer and stopping distance car.  Tests were conducted in 2 phases on 15 sites.  Each site was tested at multiple speeds, with five tests being run at each test speed.  Data obtained in both phases are tabulated.  Recommendations (based on the results) are made with regard to: the speed for survey testing (40 mph); correction to skid numbers; control site testing; reporting survey skid test data; annual verification of relationships between testing devices; testing rate; and sites with borderline skid resistance.]]></description>
      <pubDate>Wed, 13 Aug 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/34659</guid>
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    <item>
      <title>FREE SURFACE SLOPES AT CONTROLS IN CHANNEL FLOW</title>
      <link>https://trid.trb.org/View/138666</link>
      <description><![CDATA[It is commonly held that the slope of a free water surface in steady open channel flow is indeterminate at a control section.  It is shown that the surface slope is finite and, subject to certain approximations, determinate.  Expressions are derived for the surface slopes of critical flows over a smooth weir through a smooth contraction.  Experiments confirmed the validity of these expressions.  It is shown that the same expressions could have been obtained using the one-dimensional energy equation, even though the assumption of hydrostatic pressure is not valid.  The expression derived for the water surface slope yields a well-conditioned equation for numerical calculation of water surface profiles through a control.  The possibility of using surface slope at a control section as a rating parameter is mentioned.]]></description>
      <pubDate>Tue, 22 Oct 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/138666</guid>
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      <title>ACCIDENT ANALYSIS FOR PROGRAM PLANNING</title>
      <link>https://trid.trb.org/View/116130</link>
      <description><![CDATA[ACCIDENT RATES FOR A FOUR YEAR PERIOD (1945-48) HAVE BEEN ESTABLISHED FOR ALL CONTROL SECTIONS. CONTROL SECTIONS, AVERAGING A LITTLE OVER A MILE IN LENGTH, SET OFF THE ROAD SYSTEM IN UNITS WITH UNIFORM SURFACE TYPE, WIDTH, AGE AND TRAFFIC VOLUMES. ACCIDENT RATES ARE DEVELOPED FOR STANDARD-MEETING HIGHWAYS IN DIFFERENT TRAFFIC VOLUME GROUPS. THESE ROADS ARE RECENTLY-CONSTRUCTED AND CONFORMED TO DESIGN STANDARDS. IN ANNUAL PROGRAMMING THE NUMBER OF LIVES, INJURIES AND THE PROPERTY DAMAGE COSTS THAT WILL BE SAVED BY EACH YEAR'S CONSTRUCTION PROGRAM WILL BE SHOWN. IT WILL BE POSSIBLE, ALSO, TO DEVELOP TOTAL ACCIDENT REDUCTIONS OBTAINABLE BY IMPROVEMENT OF ANY PARTICULAR GROUP OF ROADS IN ACCORDANCE WITH DESIGN STANDARDS. THE ACCIDENT VALUES ARE USED WITH OTHER EVALUATIONS OF ROADWAY CHARACTERISTICS TO PRODUCE SUFFICIENCY RATINGS FOR THE ENTIRE STATE HIGHWAY SYSTEM. /AUTHOR/]]></description>
      <pubDate>Sun, 25 Jul 1971 00:00:00 GMT</pubDate>
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