As per latest IRC guidelines for designing flexible pavement of CBR method, the load parameter required is

cumulative standard axles in MSA

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number of commercial vehicles per day

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number of vehicles (all types) during life

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equivalent single axle load

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Solution

The correct option is A cumulative standard axles in MSA
As per the revised guidelines (IRC: 37 - 1984) design of flexible pavements should be based on the concept of cumulative standard axle loads (MSA) instead of the number of commercial vehicles which was done earlier.

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\begin{matrix} Number of commercial vehicles & 2723 v e h / d a y when construction is completed Annual growth rate of the traffic & 5 % Design life of the pavement & 10 y r Vehicle damage factor & 2.4 CBR value of the subgrade soil & 5 % \end{matrix}

\begin{matrix} Number of standard axles(msa) & Total thickness(mm) 20 & 620 25 & 640 30 & 670 40 & 700 \end{matrix}

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