Methodology for Checking Shortcomings in the Three-Dimensional Alignment

Road design performed by highway planning authorities and planning offices is carried out at three separate levels: the horizontal and vertical projections and the cross-section. Experiments have shown that shortcomings in the 3D alignment may still occur when these three levels are processed separately and then superimposed. So it makes sense to calculate virtual perspective views and special control parameters using visualization tools and then use them to check the 3D alignment. Shortcomings of this kind can particularly cause accidents on two-lane rural roads. Unified model assumptions that match the driver’s vision must be set to ensure the comparability of the central perspective views. Drivers absorb images from a central perspective when driving along a road. So if a driver is unable to recognize a section of the road in the driving area ahead, this gives rise to blind sections. Designers need to use, as far as possible, standard three-dimensional elements. There are two major types of shortcomings: those that are safety-related and those that are merely aesthetic. A methodology has been developed to check the 3D alignment for shortcomings in the three basic stages (checking for standard 3D elements, safety-related shortcomings and aesthetic shortcomings). By using the visualization tool “VISS ALL 3D”, the design engineer can calculate the virtual perspective views with the safety- related shortcomings and can illustrate them in the blind section graph. Shortcomings in the 3D alignment must have been eliminated at the end of the redesigning process.

  • Corporate Authors:

    Polytechnic University of Valencia

    Department of Transportation, Camino de Vera
    Valencia,   Spain  46022
  • Authors:
    • Kuhn, Wolfgang
    • Jha, Manoj K
  • Conference:
  • Publication Date: 2010


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 13p
  • Monograph Title: 4th International Symposium on Highway Geometric Design, June 2-5, 2010, Valencia, Spain

Subject/Index Terms

Filing Info

  • Accession Number: 01338143
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 28 2011 12:27PM