2Watanatada Tetal. The highway design and maintenance standards model, description of the HDM- Model[M]. Baltimore and London: The Johns Hopkins University Press, 1987.
3Lamm R, Choueiri E M, Mailaender T. Compar- ison of operating speed on dry and wet pavement of two lane rural highways[A]. Transportation Research Record 1280[C]. Washington D. C.: TRB, 1990, 199-207.
4Krammes R A, Brackett R A, Shaffer M A, etc. Horizontal alignment design consistency for rural two- lane highways[Z]. Washington D. C.: U. S. Department of Transportation, Federal Highway Administration, Research and Development, TurnerFairbank Highway Research Center, 1995.
