Longitudinal slope The lengthwise grade of a sidewalk, running parallel to the curb and generally following the natural grade of the street itself.
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.
Frequently Asked Questions About Longitudinal slope
What is longitudinal slope on a sidewalk?
The lengthwise grade running parallel to the curb, which generally follows the natural grade of the street itself.
How is it different from transverse slope?
Transverse slope is the cross pitch toward the curb and has a target range for drainage. Longitudinal slope mainly needs to be smooth and consistent along the direction of travel.
What causes longitudinal slope problems?
Abrupt dips or humps, usually from tree root heaving or settlement, which create trip hazards and accessibility issues.
Why does it matter on steep blocks?
A replacement flag must match the existing grade, or the new concrete creates an abrupt step against the neighboring sections.