SIGHT DISTANCE RELATIONSHIPS FOR SYMMETRICAL SAG CURVES WITH NONCENTERED OVERPASSES

This paper derives geometric relationships that relate the available sight distance to the vertical curve parameters, vertical clearance, location of the overpass on the curve or tangent, and locations of the observer and object. These relationships are useful for establishing the sight distance profile. Closed-form solutions of the available minimum sight distance are then derived. Values of the minimum sight distance are established for a wide range of the curve parameters and overpass locations, for highways with trucks and for parkways restricted to passenger cars. The presented methodology should prove useful in evaluating the sight distance adequacy and related cost-effectiveness analysis at critical highway locations.

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Easa, S M
  • Publication Date: 1992-6

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Filing Info

  • Accession Number: 00623458
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Jul 31 1992 12:00AM