The total thickness of pavement by CBR methods depends on the CBR value of

surface course

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subgrade

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base course

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all layers

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Solution

The correct option is B subgrade
The CBR method gives the total thickness requirement of the pavement above a subgrade and this thickness value would remain the same irrespective of the quality of materials used in component layers. Hence, for design of pavements CBR of subgrade soil is used.

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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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