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03 superelevation and spiral curves
The document discusses superelevation and spiral curves for highway design. It references sources from the American Association of State Highway and Transportation Officials Green Book and the California Department of Transportation design manual. The sources provide information on maximum relative gradient, spiral curve design components like tangent runout and transition of superelevation, and methods for determining length of runoff based on design speed and lane width.
03 superelevation and spiral curves
- 1.
- 2. Source: APolicy 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: APolicy on Geometric Design of Highways and Streets (The Green Book). Washington, DC. American Association of State Highway and Transportation Officials, 2001 4 th Ed.
- 5. Source: CalTransDesign 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 DOTStandard Road Plans RP-2 With Spirals Same as point E of GB
- 8. Source: Iowa DOTStandard Road Plans RP-2 With Spirals Tangent runout (A to B)
- 9. Source: Iowa DOTStandard Road Plans RP-2 With Spirals Removal of crown
- 10. Source: Iowa DOTStandard 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.