Question

The average daily traffic on a stretch of road is 300 commercial vehicles per lane per day. Design traffic repetitions for 10 years when vehicle damage factor is 2.5 and traffic growth rate of 7%, is

• A. 3.8 msa
• B. 45.4 msa
• C. 23.5 msa
• D. 16 msa

Answer 1

The correct option is A 3.8 msa

Cumulative number of standard axles,

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

Since the average daily traffic is given in terms of commercial vehicles per lane i.e. on a single lane, hence we will take lane distribution factor (LDF) equal to 1 for the single lane.

$=\frac{365\times 300\left[\right(1+0.07{)}^{10}-1]}{0.07}\times 2.5\times 1$
$=3.8\times {10}^6\text{standard axle}$
$=3.8msa$