Q.

If subgrade is soft or weak, a thick sub- base of cheap and inferior materials well compacted should be used.

A. false
B. true
Answer» B. true
Explanation: in transport engineering, subgrade is the native material underneath a constructed road, pavement or railway (us: railroad) track. it is also called formation level. the term can also refer to imported material that has been used to build an embankment.
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