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Why is a straight road surface often crowned or cross-sloped?

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  1. To trap water at the center
  2. To keep vehicles centered in the lane
  3. To shed rain toward the edges

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References

  1. FHWA Unpaved Road Dust Management Handbook www.fhwa.dot.gov/clas/ctip/unpaved_roads_dust/ch_6.aspx Checked 2026-10-10.

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