Highway Cross Section

The aashto green book defines a roadway crosssection as a vertical section of the ground and roadway at right angles to the centerline of the roadway including all elements of a highway or street from right of way line.

Highway cross section. When curbs are used on highways with narrow shoulders the beginning of a curb on the right shall be offset a minimum of 6 feet. Acts as a drainage layer by protecting the sub grade from wetting up. Profile view will be further discussed in another chapter.

It should be adequate to accommodate all the cross sectional elements of the highway and may reasonably provide for future development. It s how the road would look if you were actually riding on the surface of the road. It enables traffic stresses to be reduced to acceptable levels in sub grade in the road cross section so that excessive deformation is prevented.

Highway cross sections 1 rightofwaylimit for highway 40 min. 2012 odot highway design manual cross section elements 4 2 cross section 4 4 leaves the curbed section. Right of way row or land width is the width of land acquire for the road along its alignment.

These parts include centerline the travel lane shoulder sideslopes median area pedestrian and bicycle pavements drainage and clear zone. Shoulders are provided for the safe operation and to allow the development of full traffic capacity. A profile view is a lot like a longitudinal cross section of the roadway.

A cross slope should not normally exceed 3 percent on a tangent alignment unless there are three or more lanes in one direction of travel. The 7 basic cross sectional elements of a highway pavement are. To prevent ribbon development along highways control lines and building lines may be provided.

On the left the offset shall not be less than 3 feet greater than the normal curb offset figure 8 22. For tangent sections on divided highways each pavement should have a uniform cross slope with the high point at the edge nearest the median. Function of sub base in road cross section.