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Customizing Corridor Assemblies in Civil 3D

The Customizing Corridor Assemblies in Civil 3D course series is designed for Civil 3D users who need more flexibility than out-of-the-box corridor assemblies can provide. Using Subassembly Composer, you’ll learn how to create custom, project-specific subassemblies by defining geometry, parameters, targets, and behavior that respond intelligently to design conditions. The series starts with core concepts and interface fundamentals, then progresses into advanced geometry, conditional logic, and workflow organization. By the end, you’ll be able to build reusable corridor tools that reduce manual work and make complex roadway designs easier to manage and maintain.

This live online series offers 2 four-hour courses. You can take both courses or just the one that meets your needs. Each separate course is delivered in 2 two-hour sessions. A live instructor explains the detailed functions and addresses questions as the class progresses.

Note: Instructor will present using Autodesk Civil 3D 2026. Students who wish to follow along with instructor are encouraged to use the same version.

Prerequisite: Students should have a working knowledge of Autodesk Civil 3D.

Recording: Registrants for a course will receive access to a recording of each session for 7 consecutive days. Access will start the next business day after the session ends.

Customizing Corridor Assemblies in Civil 3D I

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4 hour course | 4 CPC/CEU credits

The standard Civil 3D assemblies often don’t meet the unique needs of complex corridor designs. This course teaches designers how to create custom subassemblies using Subassembly Composer. You’ll learn the interface, define points, links, shapes, and parameters, and explore advanced geometry techniques such as intersection points, curved geometry, surface links, and daylighting to build assemblies tailored to your projects.

Session 1: Understanding the Basics

  • Getting to Know the User Interface
  • Defining Points, Links, and Shapes
  • Creating Input/Output Parameters
  • Setting Up Target Parameters
  • Importing PKT Files into Civil 3D

Session 2: Advanced Geometry

  • Driving Intersection Points
  • Creating Curved Geometry
  • Using Surface Links for Roadway Rehab
  • Daylighting Parabolically
  • Understanding Auxiliary Geometry

Customizing Corridor Assemblies in Civil 3D II

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4 hour course | 4 CPC/CEU credits

Building on Level I, this course teaches advanced techniques for creating intelligent, reusable subassemblies with Subassembly Composer. You’ll explore complex geometry, conditional subassemblies, offset and filleted links, and marked points, while learning to organize workflows with embedded flowcharts, sequences, and variables. By the end, you’ll be able to develop automated corridor tools that simplify future projects and improve productivity.

Session 1: More Advanced Geometry

  • Using Marked Points with Custom Assemblies
  • Filleting Link Segments
  • Creating Offset Links
  • Developing Conditional Subassemblies with Loop Geometry

Session 2: Tools for Workflow

  • Organizing Subassembly Geometry with Embedded Flowcharts and Sequences
  • Building Switch and Enumeration Sequences Using Variables
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