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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>COMPUTER PROGRAM FOR ROAD TUNNEL VENTILATION</title>
      <link>https://trid.trb.org/View/201677</link>
      <description><![CDATA[A computer program has been prepared in order to simplify studies of longitudinal air flows in tunnels, and the related problems of pollution concentrations in tunnels and emissions of vitiated air.  The results are given as air velocity and pollution concentration along the tunnel. The program calculates steady state conditions.  The designer must give the relevant parameter values for the calculations.  Unfortunately, values given in the literature are contradictory even for such fundamentals as friction factors, drag coefficients for cars and, for instance, the shortest acceptable distance between groups of jet fans.  A short discussion of these problems is given in the paper. The program has proved itself to be a useful tool when studying alternative ventilation concepts for a road tunnel, the relative influence of the uncertainty of parameter values and different traffic flows.  (Author/TRRL)]]></description>
      <pubDate>Mon, 30 Apr 1984 00:00:00 GMT</pubDate>
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      <title>FACTORS INFLUENCING THE POWER REQUIREMENTS FOR LIGHTING IN VEHICULAR TRAFFIC TUNNELS</title>
      <link>https://trid.trb.org/View/201678</link>
      <description><![CDATA[The paper gives an outline of the influence of some important factors on the power requirements for lighting in vehicular traffic tunnels.  Some of these factors are the "critical" tunnel length, vehicle speed and the drivers adaption.  The differences in adaption depends on the topgraphy of the access area of the tunnel.  (Author/TRRL)]]></description>
      <pubDate>Mon, 30 Apr 1984 00:00:00 GMT</pubDate>
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