This tutorial demonstrates how to create and modify alignments.
You begin creating an alignment by marking the location of tangents and points of intersection for a road centerline alignment. During the creation process, curves between the tangents can be created automatically, or added later. To accommodate high-speed travel, spirals and superelevation can be added to the curves. You can enter numeric parameter values for lines, curves, and spirals in the Alignment Entities table.
If your alignment design must meet minimum standards, you can apply design criteria to an alignment either before or after it is created. This tutorial demonstrates basic alignment creation tasks. For information on applying design criteria to an alignment, see the Designing an Alignment Using Local Standards tutorial.
For more information, see the AutoCAD Civil 3D Help topic Creating Alignments.
Topics in this section
- Exercise 1: Creating an Alignment with the Alignment Layout Tools
In this exercise, you will use the alignment layout tools to draw an alignment that has curves.
- Exercise 2: Adding Free Curves and Spirals to an Alignment
In this exercise, you will add a free curve and a free spiral-curve-spiral to a simple alignment.
- Exercise 3: Adding Floating Curves to an Alignment
In this exercise, you will add two floating curve entities to a simple alignment. First, you will add a best fit floating curve that follows the most likely path through a series of points. Then, you will add a floating reverse curve with spirals.