What does "sunken grade" on a road sign mean?
Hi everyone,
I have a question about a road sign I came across. It says "sunken grade." Could someone explain what this means? I would appreciate a quick response. Thanks!
1 Answers
A sunken grade is a place where the road has literally sunk down, either into a sinkhole or because the underlying ground has shifted, according to MarieGale.com.
Sunken Grade via kwout
Sunken grades occur when the earth moves slowly beneath the road, creating a depression in the roadway.
The term "grade" is used in several different ways with respect to roads and highways. The "sub-grade" lies beneath a roadway and serves as a supporting base. "Grading" a road means to smooth out the roadbed using earth-moving equipment during the construction phase.
The grade of a highway is a measure of its incline or slope. The amount of grade indicates how much the highway is inclined from the horizontal. For more information, see Encyclopedia.com - Grades, Highway.
For a comprehensive listing of the most commonly used traffic signs in the United States, visit www.trafficsign.us and mutcd.fhwa.dot.gov.
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