EXACT MINIMUM SIGHT DISTANCE ON SAG CURVE WITH CENTERED OVERPASS

An exact solution is presented for computing the minimum sight distance on a safe vertical curve with a centered overpass for S sub m greater than L, where S sub m is the minimum sight distance; and L is the curve length. There is an apparent reservation concerning the exact solution: the curve length L cannot be explicitly expressed in terms of other variables. In practice, however, L for sag curves is normally designed based on headlight control, and the available sight distance is then checked where an overhead obstruction exists. The relationsips with restricted sight distances, and the plotting of a sight distance profile are also discussed.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8674831
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Easa, S M
• Publication Date: 1992-7

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 588-592
• Serial:
  • Journal of Transportation Engineering
  • Volume: 118
  • Issue Number: 4
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-947X
  • Serial URL: https://ascelibrary.org/journal/jtepbs

Subject/Index Terms

• TRT Terms: Curves (Geometry); Highway curves; Overpasses; Passing zones; Sight distance
• Uncontrolled Terms: Sag; Vertical curvature
• Old TRIS Terms: Sight distance, minimum non passing
• Subject Areas: Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure;

Filing Info

• Accession Number: 00623691
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 31 1992 12:00AM