Cross slope The lateral gradient of a sidewalk flag, measured perpendicular to the direction of pedestrian travel, designed to shed surface water into the curb line.
To maintain ADA compliance in NYC, the maximum allowable cross slope for a pedestrian access route is 2.00% (or a 1:50 ratio). If a sidewalk is poured too steeply, it becomes incredibly difficult and dangerous for wheelchair users to navigate without rolling or tipping sideways. During sidewalk replacement, professional contractors use precise digital levels to strike the perfect slope balance—providing adequate water drainage while keeping the walkway safe and flat.
Frequently Asked Questions About Cross slope
What is cross slope?
The lateral pitch of a sidewalk, measured perpendicular to the direction of travel, which sheds water toward the curb.
What is the maximum allowed?
For an accessible pedestrian route, generally 2 percent, a 1:50 ratio.
Why is excessive cross slope dangerous?
It pulls a wheelchair sideways and makes the route hard to travel in a straight line, and can cause tipping.
How is drainage balanced against the limit?
Enough pitch to drain, without exceeding 2 percent. Contractors use levels to hold that narrow band across the flag.