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If the level difference between the existing road surface and the new
formation level is more than 1 m, the existing surface shall be roughened
after ensuring that the minimum thickness of 500 mm of subgrade morth table 305

As per moth 305.4.3
.
305.4.3 #Earthwork over Existing Road Surface
Where the embankment is to be placed over an existing road surface, the work shall be
carried out as indicated below:
i) ii) iii) If the existing road surface is of granular type and lies within 1 m of
the new formation levels, it shall be scarified to a depth of 50 mm or as
directed so as to provide ample bond between the old and new material
ensuring that at least 500 mm portion below the top of new sub-grade
level is compacted to the desired density;
If the existing road surface is of bituminous type or cement concrete
and lies within 1 m of the new formation level, the bituminous or cement
concrete layer shall be removed completely;
If the level difference between the existing road surface and the new
formation level is more than 1 m, the existing surface shall be roughened
after ensuring that the minimum thickness of 500 mm of subgrade is
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