Curb line The boundary marking where the paved sidewalk ends and the roadway or gutter begins, forming the outer edge of the sidewalk's width.
The curb line is the far reference point DOT uses when specifying transverse slope, since flags must pitch consistently from the building line toward this edge to drain properly. It's also where curb replacement, curb cuts, and driveway apron work all take place, making it the natural dividing point between sidewalk-focused repairs and curb-focused ones. On a corner property, the curb line typically continues around the radius into the intersecting street, which is part of why corner lots often carry a larger repair obligation.
Frequently Asked Questions About Curb line
What is the curb line?
The boundary where the paved sidewalk ends and the roadway or gutter begins, forming the outer edge of the sidewalk.
Why is the curb line important?
Flags must pitch consistently from the building line toward the curb line to drain properly, so it is the far reference point for slope.
What work happens at the curb line?
Curb replacement, curb cuts and driveway apron work, which is why it divides sidewalk-focused repairs from curb-focused ones.
How does it behave at a corner?
It continues around the radius into the intersecting street, which is part of why corner lots carry a larger repair obligation.