Deriving Sight Distance on a Compound Sag and Circular Curve in a Three Dimensional Space

Insufficient roadway sight distance (SD) may become a contributing factor to traffic collisions and other unsafe traffic maneuvers. By considering human-vehicle-roadway interactions, a unified analytic framework integrating the vehicle headlight height and a three dimensional (3-d) compound sag and curve is established to determine the SD experienced by a driver traveling through this 3-d compound curve. Three dimensional compound sag and circular curves are often found along ramps, connectors and mountain roads. Practitioners can easily program these formulations on user-friendly Microsoft Excel spreadsheets to calculate a 3-d SD on most roadways with roadside clearance. This framework can be extended to SD on roadways with obstacles partially blocking vehicle headlight beams.


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  • Accession Number: 01447650
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 28 2012 10:42AM