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Chapter 2 - Design Elements and Design Controls Publication 13M (DM-2)
Although superelevation is advantageous for traffic operations, various factors often combine to make its use
impractical in many low-speed urban areas. These factors include wide pavement areas, the need to meet the grade
of adjacent property, surface drainage considerations, the desire to maintain low-speed operation, and frequency of
cross streets, alleys, and driveways. Therefore, horizontal curves on low-speed urban streets are frequently designed
without superelevation, sustaining the force solely with side friction. On these curves for traffic entering a curve to
the left, the normal cross slope is an adverse or negative superelevation, but with flat curves the resultant friction
needed to sustain the lateral force, even given the negative superelevation, is small.
For further guidance on design for low-speed urban streets, refer to the section "Design for Low-Speed Urban
Streets" in the 2004 AASHTO Green Book, Chapter 3, and Exhibits 3-12, 3-16, and 3-17.
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