The normal crown slope is 0.02 for all pavement compositions (*See Below). It is of utmost importance to show a grade point on the typical section so the Engineer will know where this slope is to begin.

For a normal two lane roadway, the grade point is on the centerline with conventional "Roof Top" slopes. In locations where two lanes of a future four lane section are being constructed, a "Roof Top" slope shall also be used.

On a divided section when two or three lanes are being constructed in each direction initially, the grade point is always on the median edge of the lane. In a normal crown section, all lanes will be sloped in the same direction from the pavement edge adjacent to the median to the outside edge of pavement. In the future when lanes are constructed in the median, the additional lane or lanes shall slope to the median.

On a divided section when two lanes are being constructed in each direction initially and provisions are being made to add a maximum of two lanes in each direction in the median, the initial lanes being constructed shall slope away from the edge of median. The future inside lanes shall slope into the median.

When grades are being computed in locations where future lanes will be constructed in the median, extreme care shall be taken in computing the grades to ensure that the future construction can be accommodated. In superelevated sections, and especially where structures are located, it may be necessary to set separate grades. In these locations, it will be necessary to make sure that the relative grades of the inside edges of the future lanes will allow future ditches or median barriers to be constructed.

*Except for roadways east of I-95 and other roadways with consistently flat grades. Pavement slope should be 0.025 (0.025 is not to be used on two lane roadways or on four lane roadways with each lane crowned at the centerline of pavement.

Roadway Design Roadway Design Manual List List data supporting the Roadway Design Manual

Roadway Design
Roadway Design Manual List

List data supporting the Roadway Design Manual