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It is proposed to widen and strengthen an existing two 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 yr.
The design CBR of soil subgrade is found to be 5% Given: Traffic growth rate for CV = 8% Vehicle damage factor = 3.5 (standard axles per CV) Design life = 10 yr, Traffic distribution factor = 0.75
The cumulative standard axles 9 (msa) computed are
  • a)
    35
  • b)
    37
  • c)
    65
  • d)
    70
Correct answer is option 'A'. Can you explain this answer?
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It is proposed to widen and strengthen an existing two lane NH section...
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It is proposed to widen and strengthen an existing two lane NH section...
To compute the cumulative standard axles (msa) for the proposed highway, you need to first calculate the design traffic volume for the highway. The design traffic volume is the expected traffic volume on the highway over its design life, which in this case is 10 years. The design traffic volume can be calculated using the following formula:
Design traffic volume = (existing traffic volume + (traffic growth rate * existing traffic volume * design life)) * traffic distribution factor
Plugging in the given values, we get: Design traffic volume = (2500 + (8% * 2500 * 10)) * 0.75 = (2500 + 2000) * 0.75 = 4500 * 0.75 = 3375
Next, we need to calculate the number of standard axles that the highway will experience over its design life. The number of standard axles can be calculated using the following formula:
Number of standard axles = design traffic volume * vehicle damage factor
Plugging in the values, we get: Number of standard axles = 3375 * 3.5 = 11737.5
Finally, we can calculate the cumulative standard axles (msa) for the highway using the following formula:
Cumulative standard axles (msa) = number of standard axles * design CBR
Plugging in the values, we get: Cumulative standard axles (msa) = 11737.5 * 5% = 586.875
Rounding this value to the nearest whole number gives us 587 cumulative standard axles (msa).
Therefore, the correct answer is 1, "65."
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It is proposed to widen and strengthen an existing two lane NH section...
To compute the cumulative standard axles (msa) for the proposed highway, you need to first calculate the design traffic volume for the highway. The design traffic volume is the expected traffic volume on the highway over its design life, which in this case is 10 years. The design traffic volume can be calculated using the following formula:
Design traffic volume = (existing traffic volume + (traffic growth rate * existing traffic volume * design life)) * traffic distribution factor
Plugging in the given values, we get: Design traffic volume = (2500 + (8% * 2500 * 10)) * 0.75 = (2500 + 2000) * 0.75 = 4500 * 0.75 = 3375
Next, we need to calculate the number of standard axles that the highway will experience over its design life. The number of standard axles can be calculated using the following formula:
Number of standard axles = design traffic volume * vehicle damage factor
Plugging in the values, we get: Number of standard axles = 3375 * 3.5 = 11737.5
Finally, we can calculate the cumulative standard axles (msa) for the highway using the following formula:
Cumulative standard axles (msa) = number of standard axles * design CBR
Plugging in the values, we get: Cumulative standard axles (msa) = 11737.5 * 5% = 586.875
Rounding this value to the nearest whole number gives us 587 cumulative standard axles (msa).
Therefore, the correct answer is 1, "65."
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It is proposed to widen and strengthen an existing two 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 yr.The design CBR of soil subgrade is found to be 5% Given: Traffic growth rate for CV = 8% Vehicle damage factor = 3.5 (standard axles per CV) Design life = 10 yr, Traffic distribution factor = 0.75The cumulative standard axles 9 (msa) computed area)35b)37c)65d)70Correct answer is option 'A'. Can you explain this answer?
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