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Indian roads congress has specified the design procedures for flexible
pavements based on CBR values.
The Pavement designs given in the previous edition IRC:37-1984 were applicable
to design traffic upto only 30 million standard axles (msa).
The earlier code is empirical in nature which has limitations regarding
applicability and extrapolation.
This guidelines follows analytical designs and developed new set of designs up
to 150 msa in IRC:37-2001.
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