Correct option is B
As per the
Indian Roads Congress (IRC) guidelines for designing
flexible pavements using the
California Bearing Ratio (CBR) method, the key load parameter is the
cumulative standard axles in millions of standard axles (msa). This parameter represents the total expected load over the design life of the pavement, expressed in terms of standard axles of 80 kN.
Reasons for selecting cumulative standard axles (msa):
1.
Traffic Consideration: Pavement design accounts for the cumulative damage caused by vehicles over the pavement's design life, rather than just the number of vehicles per day or the axle load of a single vehicle.
2.
Axle Load Equivalency: Different vehicles have different axle configurations and weights, so they are converted into an equivalent number of standard axles (80 kN) for consistency.
3.
Design Life Perspective: The msa parameter allows for considering the total traffic over the entire design life of the road, making it a comprehensive parameter for pavement design.
