Multiple choice

A payment designer has arrived at a design traffic of 100 million standard axles or a newly developing National highway as per IRC: 37 guidelines using the following data: design life = 15 years, commercial vehicles count before pavement construction = 4500 vehicles/day, annual traffic growth rate = 8%. The vehicle damage factor used in the calculation was

  1. 1.53

  2. 2.24

  3. 3.66

  4. 4.14
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B Correct answer
Explanation

The design traffic is calculated using the formula N = 365 * A * ((1+r)^n - 1) / r * D * F, where A is initial traffic, r is growth rate, n is design life, D is lane distribution factor, and F is vehicle damage factor. Given N = 100 million, A = 4500, r = 0.08, n = 15, and assuming standard lane distribution, solving for F yields approximately 2.24.

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