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Width of formation or roadway width is the sum of the widths of pavements or
carriage way including separators and shoulders.
This does not include the extra land in formation/cutting.
The values suggested by IRC are given in Table 1.
Table 1:
Width of formation for various classed of roads
| Road |
Roadway width in m |
| classification |
Plain and |
Mountainous and |
| |
rolling terrain |
steep terrain |
| NH/SH |
12 |
6.25-8.8 |
| MDR |
9 |
4.75 |
| ODR |
7.5-9.0 |
4.75 |
| VR |
7.5 |
4.0 |
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