Create offset alignments and profiles

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We're now going to add some offset alignments to our design.

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Center line alignments.

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Offset alignments are generally used to create geometry

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for road channel lines or adding road lanes.

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The advantage of using offset alignments is

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that they remain linked to the centerline alignment

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and can be edited to include changes in offset with transitions.

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We don't have to convert poly lines or worry

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about what happens if the main alignment is moved.

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Click on the conister boulevard and on the ribbon, choose offset alignment,

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offset alignments are linked to their parent alignment.

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They'll have an automatic name which you can override if you wish

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deselect from start and set the start station to zero.

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We don't want to create offsets along the existing part

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of the road which are the negative station values.

01:00

We'll create one off on the left and one officer on the right,

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both will be set to 12 ft from the center line

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at the bottom of the dialogue, set the alignment style

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to offsets

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and set the label style

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to no labels.

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Click on the widening criteria tab

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here you can add automatic widening around curves.

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This will adjust the offset alignments

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to create flared widening around the curves

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based on standards defined in a design criteria file

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or by specifying manual widening.

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Don't select these options.

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Deselect used design checks set

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on the crate offset profile tab.

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We can tell civil 3D to create offset profiles for our offset alignments

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based on a design centerline profile.

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We're using Mcallister boulevard lay out one profile.

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We can superimpose these offset profiles onto an existing profile view

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change. The superimpose onto profile view to Mcallister Boulevard one,

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this will draw offset profiles in that view.

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The profiles can be generated with a cross fall from the center line profile.

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As our road will be crowned,

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set the cross slope to minus 2%.

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Each new profile will be given an automatic name,

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set, the profile style to basic

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and click. OK.

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The offsets have been added to the drawing

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and can be managed from prospector

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in prospector, expand alignments and expand offset alignments,

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expand an offset alignment and expand profiles.

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Here you can see that it has created a profile for the offset alignments.

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When we create offset alignments,

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they are linked to the main center line alignment.

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If we move the center line,

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the offset alignment will move with it.