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Difficulty: MediumSpace Overhead

When traveling on a road with a significant crown, driving near the shoulder can cause the upper body of a tall commercial vehicle to tilt outward and strike roadside tree branches or signs, even if the tires remain on the paved roadway.

Answer: Answer

Answer

True. A road crown causes tall commercial vehicles to tilt laterally toward the shoulder, shifting the upper trailer body into the path of low-hanging tree branches and roadside signs.
The statement is true because the slope of a crowned roadway causes the top of a tall commercial vehicle to lean toward the shoulder, putting the upper corners of the trailer at risk of hitting low-hanging branches or signs near the roadside.

Step-by-Step Solution

1
Identify the physical effect of a road crown on commercial vehicle alignment.
Road crowns create a downward lateral slope toward the curb or shoulder for drainage, causing the vehicle's suspension and body to lean toward the outside edge.
Understanding roadway geometry is essential to anticipating shifts in vehicle attitude across different lane positions.
2
Analyze the relationship between vehicle height and lateral roof displacement.
Due to the vehicle's substantial height, even a minor angle of tilt at road level produces significant lateral displacement at the top edge of the trailer.
The height of a commercial vehicle amplifies ground-level angular tilt into substantial overhead shift.
3
Evaluate the clearance risk presented by roadside obstacles.
The leaning trailer roof can collide with tree branches, overhangs, or signs positioned near the curb, confirming that the statement is true.
Commercial drivers must recognize road tilt hazards and track closer to the center of the road when roadside overhead clearance is limited.

Key Concept

Road Crown and Lateral Vehicle Tilt in Overhead Space Management
Estimated Time:45s
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Topics

Space Overhead

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