Examkin

Question

Difficulty: MediumSpace Overhead

A commercial motor vehicle that safely clears a low overhead bridge while carrying a heavy cargo load is guaranteed to clear the exact same bridge on the return trip when traveling empty.

Answer: Answer

Answer

False
The statement is false because the weight of heavy cargo compresses the suspension springs and tires, lowering total vehicle height. When the vehicle is empty, the suspension rebounds and raises the top of the trailer, meaning a low clearance that barely permitted passage while loaded can result in an overhead collision when returning empty.

Step-by-Step Solution

1
Analyze the mechanical effect of cargo weight on commercial vehicle suspension.
A heavy payload compresses the vehicle's suspension springs and tires, reducing overall vertical height.
Vehicle physical dimensions vary depending on load distribution and total weight.
2
Evaluate the vehicle height change when the cargo is unloaded for the return trip.
Without cargo weight, the suspension springs extend and the trailer roof rides several inches higher.
An unladen or empty commercial vehicle has a higher ride height than a fully loaded one.
3
Determine whether clearing a low bridge while loaded ensures clearance when empty.
A bridge cleared with narrow margins while loaded may be struck on the return trip when the vehicle is empty.
Drivers cannot assume that clearing an overhead obstacle with a loaded vehicle guarantees clearance when empty.

Key Concept

Cargo Weight and Suspension Clearance Dynamics
Estimated Time:45s
Rate this question

Topics

Space Overhead

More questions from this topic