Question

The given below pertain to the design of a flexible pavement
Initial traffic = 1213 cvpd;
Traffic growth rate = 8% per annum
Design life = 12 yr;
vehicle damage factor = 2.5;
Distribution factor = 1.0
The design traffic in terms of million standard axle (msa) to be catered would be

Answer 1

Initial traffic = 1213 cvpd
Assuming this traffic as initial at the end of construction of pavement.
A = 1213 cvpd x distribution factor
= 1213 x 1 = 1213 cvpd

Growth rate, r = 8%
Design life, n = 12 year
Vehicle damage factor, F = 2.5

Cumulative number of standard axles
$N_s=\frac{365A\left[\right(1+r{)}^n-1]}{r}\times F$

$=\frac{365\times 1213\left[\right(1+0.08{)}^{12}-1]}{0.08}\times 2.5$

$=21\times {10}^6$
standard axle = 21 msa