Cross-section of a road gives some of the important design elements and features that is observed in a highway. A general cross-section of a highway in a cutting as well as on an embankment is shown in Figure 1 below.
![](https://1.bp.blogspot.com/-26xmF-seIvw/YDkIshdyBAI/AAAAAAAADLs/a1atBqwgFUwGod9IbxgXei63mrX21p48ACLcBGAsYHQ/s320/Cross-Section%2Bof%2Ba%2BRoad.JPG) |
Fig.1: Cross-Section of a Road – Geometric Design of Highways |
These features in the cross-section of the highways vary depending on the type of pavement. The pavement can be flexible or rigid pavement.
Cross-Section of a Flexible Pavement
Consider a flexible pavement as shown in the figure-2 below. The cross-sectional elements of flexible pavement in the order of their construction are:
![](https://1.bp.blogspot.com/-ycCv1sIWXYM/YDkIc9dozmI/AAAAAAAADLk/wtu6X1_gF-wJ1Q7Tsi53YYXb7Eg6LKafACLcBGAsYHQ/w476-h117/Cross-Section%2Bof%2Ba%2BFlexible%2BPavement.JPG) |
Fig.2. Cross-Section of a Flexible Pavement |
- Embankment
- Subgrade
- Subbase
- Base
- Wearing Course or Surfacing
- Carriage Way
- Treated Shoulder
- Earthen Shoulder
Cross-Section of Rigid Pavement
The cross-section of a rigid pavement involves (Figure 3)
![](https://1.bp.blogspot.com/-lXAUWFd39BI/YDkIcre0pZI/AAAAAAAADLg/-CXSAMp9spQCCxBT0v01nYHUvaucwNXBwCLcBGAsYHQ/w471-h131/Cross-Section%2Bof%2Ba%2BRigid%2BPavement.JPG) |
Fig.3. Cross-Section of Rigid Pavement |
- Embankment
- Subgrade
- Sub-base
- Concrete Pavement
- Carriage Way
- Treated Shoulder
- Earthen Shoulder
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