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4.28 out of 5
9 reviews on Udemy

Mastering AutoCAD Civil 3D: Working with corridors

This course will bring your corridor modelling skills from beginner level to intermediate/advanced.
Anthony Cook
41 students enrolled
A summary overview of the components in a corridor and the workflow to join them together.
Traditional and non-traditional innovative examples of using corridors on design projects.
Tips and tricks to maximise drawing performance, increase usability, and allow easy changes.
How to quickly create the main outputs from a corridor to illustrate your proposal.

This course will improve your existing knowledge of Autodesk AutoCAD Civil 3D Corridors. It is intended for those who already know the basics of setting up a corridor but are interested in learning more effective ways of working with the software and those who want to learn more advanced skills.

The course won’t cover every detail of corridor modelling but it will quickly but thoroughly cover the key topics in an easy to understand way. I have taught many people in the workplace the best ways to set up corridors and how to use them to your advantage to productively create drawing outputs so I believe I understand how to convey the important bits of information in a format you can understand.

There are many training courses available which are excellent for beginners or those wanting to get an overview of the whole software. In addition, I believe there is a demand for courses aimed at intermediate/advanced users who want to be able to use the software more independently at a higher level. It is important to understand, making a detailed corridor model is not always actually required. The corridor model is just a tool to help check and convey your design.

Remember: “All models are wrong, but some are useful” – George Box

Check out the course content below to see if the sections and lecture questions might be useful to you.

Note: Example drawings in this course are provided in 2013 and 2018 file versions. Although, it is recommended you use Civil 3D version 2018 or later for this course to avoid backward compatibility issues with drawing objects.

If you have a Civil 3D version below 2018 you will still be able to follow the course but some of the completed example drawings may not appear correctly when opened.


What is the course about?

This lectures explains the 5 parts of the course and points out some settings to check, and files to download to follow the examples.

How do I create a corridor inside Civil 3D?

We will recap the various components of a corridor and how to create one. It will cover alignments, profiles, sub-assemblies, assemblies, corridors, and surfaces.

Actually, what is a corridor?

Before getting stuck into the details of the software, this lecture takes a moment to step back and understand what a corridor is, and the advantages and limitations it has over other modelling types.


Confirm your understanding of the introduction topics.

Best practices on corridor component creation

What are some tips for making an alignment?

An alignment is typically the main factor controlling the position of the corridor. You need to think about the end product when starting out.

How do I make a profile, or longsection?

Once you have confirmed the alignment location, you can start to consider the vertical geometry. Although this is easy enough to change later the whole process goes smoother if you think about the levels carefully.

Can I define my road cross section in an assembly?

After this lecture you will know easy and hard ways to create assemblies. The choice of sub-assemblies is important and you need to understand what your end outputs are before you begin - in particular what surfaces you want to make from the corridor.

When should I join all the pieces to make a corridor?

Making the actual corridor is an easy step. What takes time is the problem analysis and tweaking to ensure your corridor is behaving as intended.

Is my corridor correct?

Even though the plan view of a corridor looks correct, you need to understand what all the lines mean, and what it looks like in any view.

Best practices

Test your knowledge of section 2.

Uses for corridors

What is the traditional way a corridor is used?

A corridor is typically used to model roadways. Whether these be isolated road corridors with daylight batters, or within subdivision with no interface with the existing surface. This lecture highlights the subtle differences.

What about non-traditional uses?

Remember, Civil 3D is just a tool to help you check your engineering designs and illustrate them to others. A corridor is just one tool, and it can be used in many ways, for anything that is somewhat uniform and over a reasonable distance. Some examples are railways, retaining walls (or noise walls), pipe trenches, carpark kerbs, walkways, and swales.

Can I use a corridor to model a carpark?

This lecture looks at how you can use a 'dummy' surface to speed up your carpark design using a corridor. If the term dummy surface doesn't make sense, think of it is a stage 1 design surface, temporary surface, or even a bulk earthworks surface.

Corridor uses

A short quiz on the different types of corridor applications.

Corridor output types

How do I make a surface from my corridor?

A surface is the main output from a corridor and is used a basis for other designs such as pipe networks, or earthworks. This lecture covers the key settings you should be looking out for.

How do I create cross sections?

Whether you want 1 or 100, it is a similar easy process to create cross sections. The harder part is making them look good and presenting them on a drawing.

How do I present cross sections?

You can spend a lot of time working on the presentation of your sections. The trick is to make it as automatic as possible to reduce the time it takes to update them when (not if) your corridor needs updating.

How do I project objects to my cross sections?

One last lecture on cross section presentation shows you how to project different objects to the section views to assist with presentation.

What other outputs can you do from a corridor?

A corridor can be used extensively within Civil 3D and outside the software. You can extract parts of it for contractors such as 3D polylines, or create output files that interact with other designs such as Revit and Infraworks.

Corridor outputs

Test your knowledge of corridor outputs with this quiz.


OK, I'm busy, can you summarise the contents of this course in 10 minutes?

This lecture re-iterates the steps of making a corridor and the important bits to watch out for. It quickly runs through the key parts of the process and produces some outputs.

BONUS: What else can you teach me?

LOTS. I don't pretend to know everything about the software, it is far too extensive for any one person to understand completely. For instance, you could make a whole Udemy course on making 1 sub-assembly using Autodesk Sub assembly Composer. I am looking at making some future courses, there are 7 possible topics included in this lecture.

Be sure to drop me a message, or leave a course review on what you liked about this course and what you would like to see in future courses.

You can view and review the lecture materials indefinitely, like an on-demand channel.
Definitely! If you have an internet connection, courses on Udemy are available on any device at any time. If you don't have an internet connection, some instructors also let their students download course lectures. That's up to the instructor though, so make sure you get on their good side!
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2 hours on-demand video
Certificate of Completion


AulaGEO is a Ge-engineering specialized academy.

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