Question

The width of the haul road in an opencast mine depends on

• A. Length of the dumper
• B. Width of the largest vehicle moving along haul road
• C. Number of dumpers moving
• D. Targeted production

Hint:

Think of it like designing a highway.
The width of a traffic lane is determined by the width of a standard car or truck, not by how many cars are on the road or how long the cars are.
The same logic applies to mine haul roads, just with much larger vehicles.

Answer 1

The Correct Option is B

Step 1: Think about what a haul road width must physically accommodate.
A haul road is not designed around how many trucks use it or how much coal they carry, it is designed around whether the vehicles using it can pass each other safely without running off the edge.
Step 2: Focus on the governing dimension.
Since haul roads typically carry the biggest dumpers and other heavy equipment on the mine site, the road must be wide enough to let the single largest vehicle travel, and where two lane traffic is needed, wide enough for two of the largest vehicles to pass with clearance on both sides.
Step 3: See why the other factors do not drive the width.
The length of a dumper affects turning radius at bends and switchbacks, not straight road width, and the number of dumpers or the targeted production may influence whether you build a two lane or four lane road, but even then each lane's width is still fixed by the width of the largest vehicle using it.
Step 4: Conclude.
So the parameter that truly governs haul road width is the width of the largest vehicle moving along it.
\[ \boxed{\text{Width of the largest vehicle moving along haul road}} \]