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Traffic engineering miscellaneous

Traffic Engineering

  1. It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 4 percent. Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are
    1. 35
    2. 37
    3. 65
    4. 70
Correct Option: D

Cumulative axle load, (CSA)

Ns =
365A[(1 + r)n - 1]
× F
r

= 365 × 3750 × 1 +
8
10 - 1 × 3.5 ≈ 70 msa
100
8
100



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