The CBR (California Bearing Ratio) method for flexible pavement design primarily uses:
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Structural number (SN) from traffic loadings
The subgrade CBR and design traffic (million standard axle, MSA) to determine total pavement thickness
Modulus of subgrade reaction (k) for rigid pavements
Cumulative fatigue damage approach
Correct Answer
B. The subgrade CBR and design traffic (million standard axle, MSA) to determine total pavement thickness
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IRC 37 (flexible pavement): total pavement thickness from subgrade CBR vs design traffic charts. Design traffic in terms of MSA (million standard axles) based on initial traffic, growth rate, design life, and VDF (vehicle damage factor).
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