Question

The correct order of pavement layers for a haul road from top to bottom is

• A. Wearing course $\rightarrow$ Base $\rightarrow$ Sub base $\rightarrow$ Sub grade
• B. Wearing course $\rightarrow$ Sub base $\rightarrow$ Base $\rightarrow$ Sub grade
• C. Wearing course $\rightarrow$ Sub grade $\rightarrow$ Sub base $\rightarrow$ Base
• D. Wearing course $\rightarrow$ Base $\rightarrow$ Sub grade $\rightarrow$ Sub base

Hint:

Remember: Surface → Base → Sub-base → Soil. This order applies to most flexible pavements.

Answer 1

The Correct Option is A

Step 1: Understand pavement layer hierarchy.
A typical pavement structure from top to bottom is:
Wearing course (surface layer)
$\rightarrow$ Base course
$\rightarrow$ Sub-base course
$\rightarrow$ Sub-grade (natural soil).
Step 2: Match with options.
Option (A) matches the exact standard sequence used in haul roads and most flexible pavements.
Thus, the correct order is option (A).
Final Answer: (A)