DEVELOPING TOOLS AND TECHNIQUES FOR GEOMETRIC DESIGN OF HIGHWAYS

A DISCUSSION IS PRESENTED ON RESEARCH AND DEVELOPMENT OF SPECIAL TOOLS AND TECHNIQUES FOR USE IN GEOMETRIC DESIGN OF HIGHWAYS, WITH PARTICULAR EMPHASIS ON INTERCHANGE DESIGN. THE TECHNIQUES PRESENTED PROVIDE THE MEANS OF STEPPING UP ENGINEERING PRODUCTIVITY BY: (1) REDUCING MANPOWER REQUIREMENTS, (2) UTILIZING EFFECTIVELY YOUNG AND INEXPERIENCED ENGINEERS, AND (3) PRODUCING DESIGNS OF HIGHER QUALITY. NEARLY ALL COMPUTATIONS FOR INTERCHANGE DESIGN ARE ELIMINATED BY USE OF THREE-CENTERED CURVE TEMPLATES COUPLED WITH DESIGN TABLES AND GRAPHICS, INCLUDING SLIDE RULE DETERMINATION BY PARABOLIC DISTRIBUTION OF FLARE AND TAPER OFFSETS. GEOMETRIC DESIGN OF INTERCHANGES ALSO IS GREATLY FACILITATED BY THE USE OF ALIGNMENT TEMPLATES. THESE PRECLUDE TEDIOUS GRAPHICAL CONSTRUCTION AS A PREREQUISITE TO CALCULATIONS. DATA TAKEN FROM TEMPLATES ARE FED INTO AN ELECTRONIC COMPUTER TO PRODUCE A COMPLETE SOLUTION. AN ALIGNMENT FOR MOST RAMPS CAN BE SELECTED IN 15 OR 20 MINUTES AND SOLVED ON THE COMPUTER IN ANOTHER 25 MINUTES. BY THIS METHOD, THE ALIGNMENT OF A CLOVERLEAF INTERCHANGE CAN BE COMPLETELY WORKED OUT IN ONE DAY, COMPARED TO A WEEK OR LONGER BY THE PREVIOUS METHOD WITHOUT TEMPLATE AND ELECTRONIC COMPUTER.

  • Supplemental Notes:
    • Vol 38, pp 321-352, 27 FIG
  • Authors:
    • LEISCH, J E
  • Publication Date: 1959

Media Info

  • Monograph Title: Proceedings of the Thirty-Eighth Annual Meeting of the Highway Research Board, Washington, D.C., January 5-9, 1959
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00203286
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 14 1994 12:00AM