Share Email Facebook Twitter LinkedIn Adding Tangents and Curves to Profiles Topics in this section About Adding Tangents and Curves to a Layout Profile You can add fixed, floating, or free tangents and curves to a layout profile. About Vertical Curve Design Designing vertical curves in layout profiles requires that you understand the concepts described in this topic. To Add Fixed Tangents to Profiles To Add Floating Tangents to Profiles To Add Free Vertical Tangents to a Profile To Extend Profile Tangents to a PVI To Add Fixed Vertical Curves to Profiles To Add Floating Vertical Curves to Profiles To Add Free Vertical Curves to a Profile To Change the Constraint Type of Vertical Curves for Backward Compatibility To Change the Constraint Type of a Free Parabolic or Circular Vertical Curve About Equations For Calculating Crest and Sag Curve Lengths in Profiles Autodesk Civil 3D can calculate values from the geometric definition of a vertical curve, PVI information, as well as object and eye height. To Extend Fixed and Floating Profile Entities Parent topic: Profiles