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03 superelevation and spiral curves
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03 superelevation and spiral curves

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transportation engineering

transportation engineering

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  • 1. Superelevation and Spiral Curves
  • 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. 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.
  • 5. Source: CalTrans Design Manual online, http://www.dot.ca.gov/hq/oppd/hdm/pdf/chp0200.pdf
  • 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. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Same as point E of GB
  • 8. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Tangent runout (A to B)
  • 9. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Removal of crown
  • 10. Source: Iowa DOT Standard Road Plans RP-2 With Spirals Transition of superelevation Fully superelevated
  • 11. Length of Components (Cont.)
    • 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)
    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.