In the absence of complete field data, the average annual daily traffic (AADT) after considering seasonal variations, can be determined from the formula (IRC: SP: 72-2007)-.But the design methodology has taken rapid strides towards rationality in the past few decades based on an understanding of the stresses and strains in the layers constituting the pavement and application of the concept of reliability in achieving the desired level of service during the pavements design life.IRC Guidelines for Low Traffic Volume Roads: (IRC: SP: 72-2007 and IRC: SP: 77-2008) 5.
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