In this movie, you create a Profile, which is the second component needed to build a Civil 3D Corridor. It represents a side projection that shows the topography of the terrain in relation to the road (or in this case bridge) you are creating.

Using 3ds Max Design with Civil 3D - Part 08

The official learning channel for Autodesk® 3ds Max® software, a comprehensive 3D modeling, animation, rendering, and compositing solution for games, film, and motion graphics artists. The Autodesk® 3ds Max® Learning Channel provides tutorials of all levels to help you learn Autodesk® 3ds Max®.