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03 superelevation and spiral curves

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03 superelevation and spiral curves

  1. 1. Superelevation and Spiral Curves
  2. 2. Source: A Policy on Geometric Design of Highways and Streets (The Green Book). Washington, DC. American Association of State Highway and Transportation Officials, 2001 4 th Ed.
  3. 3. Source: A Policy on Geometric Design of Highways and Streets (The Green Book). Washington, DC. American Association of State Highway and Transportation Officials, 2001 4 th Ed.
  4. 4.
  5. 5. Source: CalTrans Design Manual online, http://www.dot.ca.gov/hq/oppd/hdm/pdf/chp0200.pdf
  6. 6. Maximum Relative Gradiant (G) Source: A Policy on Geometric Design of Highways and Streets (The Green Book). Washington, DC. American Association of State Highway and Transportation Officials, 2001 4 th Ed.
  7. 7. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Same as point E of GB
  8. 8. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Tangent runout (A to B)
  9. 9. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Removal of crown
  10. 10. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Transition of superelevation Fully superelevated
  11. 11. Length of Components (Cont.) <ul><li>Length of Runoff: function of design speed, rate of attainment, and width of lanes – See Exhibit 3-29 p. 174 for two and four lane highways (based on appearance and comfort) </li></ul>Source: A Policy on Geometric Design of Highways and Streets (The Green Book). Washington, DC. American Association of State Highway and Transportation Officials, 2001 4 th Ed.

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