Question

For a newly developed highway with a design traffic of 100 msa and design life of 20 years, the commercial vehicles count is 5000veh/day. If the annual traffic growth rate is 9%, then the axle load of the vehicle in kg is (Lane distribution factor =1)

Answer 1

$N=\frac{365[{(1+\frac{r}{100})}^n-1]\times A\times VDF\times LDF}{\frac{r}{100}}$

$100\times {10}^6=\frac{365[{(1+\frac{9}{100})}^{20}-1]\times 5000\times VDF\times 1}{\frac{9}{100}}$

$VDF=1.07$

Standard axle load = 8200 kg
${\left(\frac{\text{Axle Load in kg}}{8200}\right)}^4=1.07$

$\text{Axle load}=8341.9kg$