Unlike transverse slope, which is specified as a target range for drainage, longitudinal slope typically just needs to be smooth, consistent, and free of abrupt grade changes that could create trip hazards or accessibility problems along the direction of travel. Sudden dips or humps along this axis — often from tree root heaving or settling — are usually what triggers a violation tied to longitudinal grade rather than a drainage complaint. On steep blocks, matching this slope correctly during a flag replacement is what keeps the new concrete from creating an abrupt step relative to neighboring sections.
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