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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>THE INFLUENCE OF TEXTURE ON THE MOISTURE CHARACTERISTICS OF SOILS. /PART 1/ A CRITICAL COMPARISON OF TECHNIQUES FOR DETERMINING THE AVAILABLE-WATER CAPACITY AND MOISTURE CHARACTERISTIC CURVE OF A SOIL</title>
      <link>https://trid.trb.org/View/123590</link>
      <description><![CDATA[WHEN THE 1/3 AND 15ATM. PERCENTAGES WERE USED AS THE UPPER AND LOWER LIMITS OF AVAILABLE-WATER, RESPECTIVELY, THE VALUE FOR THE AVAILABLE-WATER CAPACITIES /AWCS/ OF THE SOILS STUDIED WERE SMALLER THAN THOSE OBTAINED BY USING THE DIRECT SAMPLING TECHNIQUE FOR THE UPPER LIMIT, AND THE PERMANENT WILTING PERCENTAGE /DETERMINED ON SOIL CORES/ FOR THE LOWER LIMIT OF AVAILABLE- WATER, THE DIFFERENCES VARIED FROM 9 TO 76 PERCENT WITH A MEAN OF ALMOST 40 PER CENT FOR THE ELEVEN SOILS STUDIED. THE IMPORTANCE OF TECHNIQUES FOR THE DETER- MINATIONS OF THE AWC OF SOILS IS DISCUSSED. THE MOISTURE CHARACTERISTIC OF A SOIL WOULD BE CONSIDERABLY INFLUENCED BY THE STRUCTURE OF THE SOIL SAMPLE ON WHICH THE DETERMINATION WAS MADE, AND IT IS CONCLUDED THAT THE MOISTURE CHARACTERISTIC SHOULD BE DETERMINED ON UNDISTURBED SOIL CORES. /RRL/A/]]></description>
      <pubDate>Thu, 01 Dec 1994 00:00:00 GMT</pubDate>
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      <title>EXPLORATION OF VOLUME-CAPACITY-SPEED RELATIONSHIPS ON URBAN ARTERIAL STREETS</title>
      <link>https://trid.trb.org/View/114924</link>
      <description><![CDATA[AN INVESTIGATION WAS CONDUCTED TO RELATE TRAVEL SPEEDS TO VARYING CAPACITIES AND VOLUMES FOR SUBSTANTIAL LINKS OF URBAN ARTERIAL STREETS. DATA WERE COLLECTED ON 6 URBAN ARTERIAL STREETS IN RALEIGH, NORTH CAROLINA. POTENTIAL BOTTLENECKS ALONG EACH ROUTE WERE EVALUATED TO DETERMINE THEIR EFFECT UPON TRAFFIC FLOW. EACH SITE WAS THEN ANALYZED TO ASCERTAIN OVERALL VOLUME-CAPACITY-TRAVEL SPEED RELATIONSHIPS WHICH WOULD REFLECT THE DRIVERS' REACTION TO OPERATIONAL AND ENVIRONMENTAL CONDITIONS ENCOUNTERED. INDIVIDUAL SPEED-VOLUME/CAPACITY RATIO CURVES ARE PRESENTED FOR EACH TEST SEGMENT. FOR THE 6 SITES STUDIED NO VOLUMES REACHED SUFFICIENT LEVELS TO CAUSE A BREAKDOWN ON THE FACILITY. A SIGNIFICANT REDUCTION IN AVERAGE OVERALL TRAVEL SPEED IS APPARENT ON THE 45-MPH FACILITIES AS THE VOLUME/ CAPACITY RATIO INCREASES IN LEVEL OF SERVICE. A LESS SIGNIFICANT REDUCTION IN AVERAGE OVERALL TRAVEL SPEED IS APPARENT ON THE 35-MPH FACILITIES AS THE VOLUME/CAPACITY RATIO INCREASED IN LEVEL OF SERVICE. NO MAJOR VARIATIONS OR REDUCTIONS IN AVERAGE OVERALL TRAVEL SPEED ARE EVIDENT FOR THE MID-RANGE OF VOLUME-CAPACITY RATIOS. FOR V/C RATIOS IN THE GENERAL RANGE OF 0.4 TO 0.6, THERE APPEARS TO BE SOME SMALL INCREASE IN TRAVEL SPEED COMPARED TO THE SPEEDS AT RATIOS 0.2 TO 0.4. AT V/C RATIOS BETWEEN 0.1 AND 0.6 THE MOST SIGNIFICANT VARIABLE AFFECTING OVERALL TRAVEL SPEED ON URBAN AND SUBURBAN ARTERIALS APPEARS TO BE THE SIGNAL PROGRESSION AND TIMING. IT IS CONCLUDED THAT IT IS NOT FEASIBLE TO SHOW ANY TYPICAL SPEED VOLUME CURVE FOR URBAN ARTERIALS REPRESENTING ACTUAL VOLUMES OBTAINED UNDER IDEAL CONDITIONS.]]></description>
      <pubDate>Thu, 28 Apr 1994 00:00:00 GMT</pubDate>
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