Several concerns have been documented in the literature regarding AASHTO’s Green Book guidelines for horizontal curve design. Specifically, some researchers are concerned that the side friction factors are dated and do not reflect today’s drivers, vehicles, and pavements. Some also are concerned that the superelevation distribution method recommended in the Green Book, in combination with the use of multiple maximum superelevation rates, does not promote design consistency. Side friction factors and a distribution method that resolve these concerns have been developed.
Get full access to this article
View all access options for this article.
References
1.
A Policy on Geometric Design of Highways and Streets. American Association of State Highway and Transportation Officials, Washington, D.C., 1994.
2.
BonnesonJ. A.NCHRP Report 439: Superelevation Distribution Methods and Transition Designs. TRB, National Research Council, Washington, D.C., 2000.
3.
A Policy on Geometric Design of Rural Highways. American Association of State Highway Officials, Washington, D.C., 1954.
4.
HaywardJ. C.Highway Alignment and Superelevation: Some Design-Speed Misconceptions. In Transportation Research Record 757, TRB, National Research Council, Washington, D.C., 1980, pp. 22–25.
5.
KrammesR. A., BrackettR. Q., ShaferM. A., OttsenJ. L., AndersonI. B., FinkK. L., CollinsK. M., PendletonO. J., and MesserC. J.Horizontal Alignment Design Consistency for Rural Two-Lane Highways. Report FHWA-RD-94-034. FHWA, U.S. Department of Transportation, Washington, D.C., 1995.
6.
Richtlinien für die Anlage von Straßen, RAS, Teil: Linienführung, RAS-L. Forschungsgesellschaft für Strassenund Verkehrswesen (in German). Kirschbaum Verlag, Bonn, Germany, 1995.
7.
CrausJ., and LivnehM.Superelevation and Curvature of Horizontal Curves. In Transportation Research Record 685, TRB, National Research Council, Washington, D.C., 1978, pp. 7–13.
8.
KanellaidisG.Aspects of Highway Superelevation Design. Journal of Transportation Engineering, Vol. 117, No. 6, Nov./Dec.1992, pp. 624–632.
