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Difficulty: EasySpace Overhead

A section of highway running beneath an older overpass has recently received a new layer of asphalt repaving. How does this road resurfacing affect the overhead clearance for commercial motor vehicles?

  1. A
    The overhead clearance remains completely unchanged because highway departments automatically elevate the bridge structure during resurfacing.
  2. The vertical clearance decreases, which can make the posted clearance height sign inaccurate.Answer
  3. C
    The overhead clearance increases because the fresh asphalt smooths out road dips and uneven surface grades.
  4. D
    The overhead clearance changes only when ambient temperatures cause thermal expansion of the road surface.

Answer

The vertical clearance decreases, which can make the posted clearance height sign inaccurate.
Repaving adds thickness to the roadway surface, raising the ground level while the overhead structure remains fixed. This directly reduces the available vertical clearance, meaning that posted height warning signs may no longer reflect the actual available space.

Step-by-Step Solution

1
Identify the physical change occurring on the roadway.
Repaving applies new layers of asphalt on top of existing roadbeds, raising the road grade elevation.
Understanding roadway construction helps determine its impact on vertical dimensions.
2
Calculate the effect on overhead space beneath a fixed overpass.
Raising the ground level while the overhead bridge height remains static reduces the total vertical clearance gap.
Clearance is the exact distance between the road surface and the lowest overhead obstruction.
3
Evaluate the reliability of existing posted clearance warning signs.
Posted clearance signs often reflect measurements prior to repaving and may not be updated immediately.
Drivers must recognize that posted signs can overstate actual clearance following resurfacing work.

Key Concept

Road resurfacing elevates the road level and reduces overhead clearance beneath fixed structures.
Estimated Time:45s
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Topics

Space Overhead

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