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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>
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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>Transport Research International Documentation (TRID)</title>
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      <title>GRAPH-THEORETICAL MODEL FOR SLOW TRANSIENT ANALYSIS OF PIPE NETWORKS</title>
      <link>https://trid.trb.org/View/301769</link>
      <description><![CDATA[Research is reported which accomplished the following: developed an incidence method for slow transient analysis; discussed numerical methods for integrating stiff ordinary differential equations (ODE), where initial value problems with strongly decreasing and increasing solution components are classified as stiff problems; proposed a technique for adjusting flow rates in pipes to satisfy mass continuity, since application of a rigid model theory violates mass continuity at nodes; and compared numerical results for slow and rapid transients predicted from either rigid or elastic water column models.  It was found that a new method (incidence method) for analyzing slow transients in complicated and large-scale pipelines can be formulated in graph-theoretical framework using incidence matrices, and that the incidence method is superior to the loop method for analyzing slow transients in terms of addressing full valve-closure problems.  Other findings of the study are also discussed.]]></description>
      <pubDate>Tue, 31 Oct 1989 00:00:00 GMT</pubDate>
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      <title>ACCIDENTS ON RURAL INTERSTATE AND PARKWAY ROADS AND THEIR RELATION TO PAVEMENT FRICTION</title>
      <link>https://trid.trb.org/View/47243</link>
      <description><![CDATA[Friction measurements were made with a skid trailer at 70 mph (31 m/s) on 770 miles (1240 km) of rural, four-lane, controlled-access routes on Interstate and parkway systems in Kentucky.  Each construction project was treated as a test section.  Accident experience, friction measurements, and traffic volumes were obtained for each.  Various relationships between wet-weather accidents and skid resistance were analyzed.  Averaging methods were used to develop trends and minimize scatter.  A moving average for progressively ordered sets of five test sections yielded more definite results.  The expression of accident occurrence that correlated best with skid and slip resistance was wet- weather accidents per 100 million vehicle miles (161 million vehicle km).  Accidents (at 70 mph (31 m/s)) increased greatly as skid numbers decreased from 27.  Analysis of peak slip numbers and accident occurrences indicated similar trends.]]></description>
      <pubDate>Wed, 03 Nov 1976 00:00:00 GMT</pubDate>
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      <title>BRAKING EFFICIENCY TEST TECHNIQUE</title>
      <link>https://trid.trb.org/View/42557</link>
      <description><![CDATA[The study describes a method whereby vehicle stopping performance can be specified, measured, and compared independently of the test surface. The method provides for an independent measure of the prevailing friction potential of the test surface. This measure is used to normalize the measured stopping performance of the test vehicle. The concept presented is tailored toward a safety argument and toward rulemaking as a potential adaptation to braking effectiveness requirements which currently exist. A new mobile tire dynamometer, developed for this program, is discussed.]]></description>
      <pubDate>Tue, 13 Jul 1976 00:00:00 GMT</pubDate>
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      <title>THE IMPORTANCE OF TIME IN THE TRANSPORT FIELD</title>
      <link>https://trid.trb.org/View/39315</link>
      <description><![CDATA[The binomial equation journey cost/journey time is one of the most important factors in the behaviour of road users as regards the selection of transport mode and itinerary. Various theoretical and practical methods of accurately evaluating the value given to time by the road user are described. In order to treat the problem objectively, time value is related to the average salary, thus giving A monetary assessment. The concept of generalised time is used. This concept comprises the actual journey time, changes from mode to mode, number of these changes and discomfort during the journey. /TRRL/]]></description>
      <pubDate>Wed, 27 Aug 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/39315</guid>
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      <title>OPTIMIZATION METHODS IN HIGHWAY PLANNING /IN PORTUGUESE/</title>
      <link>https://trid.trb.org/View/91317</link>
      <description><![CDATA[THE METHOD TO BE USED IN ESTABLISHING AN OPTIMUM POLICY FOR THE APPLICATION OF RESOURCES IN HIGHWAY NETWORKS IS PRESENTED. THE METHOD IS BASED ON THE FORMULATION OF A LINEAR PROGRAMMING MODEL. THE INPUT VARIABLES ARE OBTAINED FROM THE FOLLOWING QUANTITATIVE INFORMATION SOURCES: (1) TRAFFIC FORECASTING FOR THE NETWORK, (2) ANNUAL COST PER VEHICLE AND COST PER NETWORK HIGHWAY, AND (3) CONSTRUCTION COSTS FOR THE ALTERNATIVES CORRESPONDING TO EACH NETWORK HIGHWAY. THE MODEL CONSTRUCTION REQUIRES THE KNOWLEDGE OF THE LIMITATIONS IMPOSED BY REGIONAL PLANNING AND BY THE GEOGRAPIC STRUCTURE. THE NETWORK GEOMETRY IS REFLECTED IN THE MODEL BY AN INCIDENCE MATRIX THAT SHOWS THE POSSIBLE JOURNEYS. THE NETWORK IS DEVELOPED IN DIFFERENT STAGES UNTIL THE OBJECTIVE DEFINED BY REGIONAL PLANNING IS MET. THE APPLICATION OF THIS METHOD WILL INDICATE THE BEST WAY TO INVEST IN THE NETWORK AND WHICH STAGES WILL REDUCE THE OPERATING COSTS OF THE NETWORK TO A MINIMUM. THIS METHOD MAY BE APPLIED TO THE ANALYSIS OF NETWORKS MUCH MORE COMPLEX AND WITH OTHER LIMITATIONS. /RRI/]]></description>
      <pubDate>Sat, 30 Sep 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/91317</guid>
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