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Difficulty: MediumSpace Overhead

When a long combination commercial vehicle travels through a sharp pavement dip directly beneath an overpass, the effective vertical clearance between the top of the trailer and the overhead structure can decrease due to the upward pitch of the vehicle as its axles traverse the incline.

Answer: Answer

Answer

True
The statement is true because the vertical geometry of a road dip forces a long vehicle into a pitch angle where the upper corners of the trailer tilt upward toward the bridge deck, reducing safe overhead clearance.

Step-by-Step Solution

1
Analyze the vehicle geometry and road profile
Identified that a long-wheelbase vehicle spanning a dip does not sit completely flat at the lowest point of the pavement.
Vehicle axles traverse entry and exit slopes at different times, creating dynamic pitch angles.
2
Evaluate the effect of vehicle pitch on overhead clearance
Determined that as the front wheels climb the exit slope while the rear wheels are on the approach slope, the upper structure tilts upward.
Rotational pitch around the vehicle's suspension pivot points elevates the upper edges of the trailer toward the overhead obstacle.
3
Determine the validity of the statement
The statement accurately describes how road dips reduce effective overhead clearance.
Commercial drivers must recognize that vertical road geometry can cause clearance loss even if the static bridge height appears adequate.

Key Concept

Impact of Roadway Vertical Curvature and Vehicle Pitch on Overhead Clearance
Estimated Time:45s
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Topics

Space Overhead

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