CONSIDERATIONS IN RATING URBAN STREETS

THE PRESENT METHOD OF SUFFICIENCY RATING USED IN CONNECTICUT WAS DEVELOPED TO COVER THE NEEDS OF THE STATE HIGHWAY DEPARTMENT. THE PROBLEM OF APPLYING THIS METHOD TO RATING URBAN STREETS IS DISCUSSED. ACCIDENT EXPERIENCE USED IN THE CONNECTICUT SUFFICIENCY RATING APPEARS TO BE THE ONLY ELEMENT HAVING A DIRECT AND IMPORTANT BEARING ON URBAN SUFFICIENCIES. FOR URBAN SUFFICIENCY RATING IT IS BELIEVED THAT THE ELEMENTS WHICH REFLECT OR INFLUENCE THE FOUR FRICTIONS MUST BE WEIGHTED: INTERSECTIONAL, MEDIAL, MARGINAL, AND INTERNAL STREAM. THE VOLUME AND TIME CONSUMED BY CROSSING TRAFFIC AT THE MEASURED INTERSECTIONS IS IMPORTANT TO THE EVALUATION. IT HAS BEEN ADVOCATED THAT THE AVERAGE SPEED OBTAINED ON DIFFERENT ROUTES SERVES AS A MEASURE OF THE RELATIVE CONGESTION ON THESE ROUTES. BECAUSE THE AVERAGE SPEED PROVIDES AN INDEX OF THE ABILITY TO MOVE THROUGH AN ARTERY, IT WOULD BE INDICATIVE OF THE EFFICIENCY OF THAT ARTERY. IT IS CONCLUDED THAT THE OBJECTIVE OF AN IDEAL URBAN ARTERIAL MAY WELL BE THE ATTAINMENT OF THE HIGHEST UNIFORM SPEED WITH THE LOWEST ACCIDENT EXPERIENCE. HOWEVER, THE RATING WOULD HAVE TO INCLUDE TRAFFIC VOLUMES OR BE DEVELOPED FOR EACH TRAFFIC-VOLUME GROUP.

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  • Supplemental Notes:
    • No 53, pp 14-16 Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
  • Authors:
    • Hooper, Curtis J
  • Publication Date: 1952

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  • Accession Number: 00200271
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 10 1994 12:00AM