What is a special type of grading object that fills a void in a grading group?

• A. Fill
• B. Pad
• C. Infill
• D. Dike

Answer: (C)

In Civil 3D grading, an infill object is used to address interior gaps within a grading group. It adds material specifically to fill a void, creating a continuous surface where there was a hole or missing area inside the graded region. This makes it the best match when the goal is to "fill a void" inside the existing grading.

A fill object is more about raising terrain over a region to meet a target grade, not necessarily addressing interior holes. A pad creates a flat platform, usually for a building pad, rather than filling a void in the grading. A dike is a raised barrier for drainage or water containment, not about filling interior voids.