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Superelevation and Spiral Curves

Superelevation and Spiral Curves. 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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Superelevation and Spiral Curves

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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 4th 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 4th Ed.

  4. Source: CalTrans Design Manual online, http://www.dot.ca.gov/hq/oppd/hdm/pdf/chp0200.pdf

  5. 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 4th Ed.

  6. Same as point E of GB With Spirals Source: Iowa DOT Standard Road Plans RP-2

  7. With Spirals Tangent runout (A to B) Source: Iowa DOT Standard Road Plans RP-2

  8. With Spirals Removal of crown Source: Iowa DOT Standard Road Plans RP-2

  9. With Spirals Transition of superelevation Fully superelevated Source: Iowa DOT Standard Road Plans RP-2

  10. 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 4th Ed.

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