Author: Gaurav Bagga AutoCAD, AutoCAD Civil 3D

During training at Ideate, Inc, we are often asked how to add segment to an alignment.
Adding a segment to an alignment works sometimes and other times the alignment style seems to get applied but station labels do not appear. If you have been using Civil 3D before then I am positive you have seen this.
So the concept is, just as an alignment has a direction, every component of an alignment: lines, curves and spirals have a direction, which is displayed by the arrow component of the alignment style. If the direction of this segment is against the main alignment direction, the labels do not appear even though the segment gets added to the alignment – evident because color changes: alignment style gets applied. Here is how it works.
When you click on the button “Convert AutoCAD Line and arc” to add the lines/arcs at the beginning or end of the alignment to the alignment as shown below:


  1. Labels do not appear even though the segment got added to the alignment. In the figure below you can see the white AutoCAD line turn green.


  2. Click on the button “Reverse Sub-entity Direction” which is one icon to the right of “Convert AutoCAD Line and arc” icon as shown below.

See the label -0+59 appears as below:

​That’s it; you are done. Now go ahead and add other segments as necessary.

If the negative station number is unacceptable, change it via the Reference Point under the Station Control tab of Alignment Properties.

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     Gaurav Bagga
Gaurav Bagga
Senior Application Specialist Infrastructure

Gaurav is a Senior Application Specialist for Infrastructure Solutions at Ideate based out of San Francisco. He has over 18 years of experience in construction and related software industry. With this extensive design technology background he helps engineering and surveying companies, federal and state government agencies, and ENR 500 firms critically analyze and improve their construction drawing production process. He implements Civil infrastructure design technology led by InfraWorks and Civil 3D and has helped Ideate grow Civil Infrastructure Services. Being an industry recognized speaker he has presented cutting edge design technology at several industry conferences such as Autodesk University. Find Gaurav on Twitter.