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Super Elevation Table Facts

Updated May 10, 2016

This article applies to:
  • RoadEng Civil

  • The blank area of the table represents unsafe combinations of radius and speed.

  • The top of each column in the body of the table is the maximum super-elevation. Given a speed, the corresponding radius is the minimum allowed; given a radius, the corresponding speed is the maximum allowed.

  • Super-elevation is defined by rise over run – the tangent of the angle (not %).

  • Interpolation means that if the speed or radius is in between table entries, the super-elevation value will be linearly interpolated between the values in the body of the table.

  • This table is stored in the template table (inside a design document or in an external file).

  • Super-elevation tables can be imported/exported from/to simple text files (comma or tab delimited). Spreadsheet programs can also import and export these files.

  • Lines starting with “#” characters are excluded from the table when importing text files – the comments at the top of the table in the figure above were marked in this way.

  • Softree does not (as of this printing) provide officially approved tables. However, there are metric and English versions included in the RoadEng install (<Defaults and Layouts>\Superelevation EMax 06.tbl and Superelevation EMax 06 - Feet.tbl, respectively).