HIGHWAY INTERSECTIONS, DESIGN AND APPLICATION

MORE ATTENTION SHOULD BE PAID TO ORDINARY INTERSECTIONS AT GRADE WHICH CONSTITUTE THE MASS OF HIGHWAY INTERSECTIONS. PROPER TRAFFIC CONTROL AND SAFETY DEPEND UPON THE SUCCESSFUL OPERATION OF THESE INTERSECTIONS WHICH ARE FOCAL POINTS OF CONGESTION AND HIGHWAY ACCIDENTS. AN INTERSECTION THAT REQUIRES MANY VEHICLES TO SWING WIDE ON TURNING AND LEAVE THE PROPER LANE OR LEAVE THE PAVEMENT IS A POTENTIAL SOURCE OF ACCIDENTS AND A HEADACHE AND EXPENSE TO THE MAINTENANCE DEPARTMENT. TO THOSE INTERESTED IN THE HIGHER TYPES OF INTERSECTIONS SUCH AS ROTARIES AND GRADE SEPARATIONS CORRECT PRINCIPLES FOR SIMPLE INTERSECTIONS AT GRADE ARE VERY IMPORTANT BECAUSE AN ELABORATE INTERSECTION SCHEME IS NO BETTER THAN ITS WEAKEST PART. ACCIDENTS AT A GRADE SEPARATION, FOR EXAMPLE, DO NOT OCCUR AT THE INTERSECTION OF THE TWO ROADS, AT WHICH POINT TRAFFIC IS DEFINITELY SEPARATED, BUT AT THE ENTRANCE OR EXIT OF AN ACCESS DRIVE WHICH, FOR ALL PRACTICAL PURPOSES, IS A SIMPLE INTERSECTION AT GRADE. VARIOUS CONVENTIONAL INTERCHANGES, INCLUDING THE DESIGN FOR THE VEHICLES UTILIZING THEM ARE DISCUSSED. DESIGN LOADS IN GEOMETRIC HIGHWAY DESIGN ARE THE TRAFFIC DENSITY, THE TYPE OF TRAFFIC AND DESIGN SPEED. CRITERIA FOR THESE DESIGN LOADS ARE DISCUSSED AND ILLUSTRATED AS WELL AS ACCELERATION AND DECELERATION LANES, ISLANDS, CHANNELS AND SIGHT DISTANCES AND THEIR RELATIONSHIP WITH SIGNING. /AUTHOR/

  • Authors:
    • Barnett, J
  • Publication Date: 1939-10

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  • Accession Number: 00203272
  • Record Type: Publication
  • Report/Paper Numbers: pp 26-45
  • Files: TRIS
  • Created Date: Jun 10 1994 12:00AM