Curb -

: Standard curbs often feature a 1- to 2-inch radius for architectural purposes, while specialized curbs, such as those for skateboarding, may use a sharper 3/4-inch radius.

A "curb cut" is a small ramp built into a curb to allow smooth passage between the sidewalk and street. : Standard curbs often feature a 1- to

: Originally pioneered in 1945 for World War II veterans in wheelchairs, they became a central focus of disability rights activism. while specialized curbs