Autodesk Civil 3D 2020 creates the following entities:
The following alignments on layer {Roundabout Name}Alignments:
{Roundabout Name}RoundelApron {Roundabout Name}RoundelCirculatoryCrown {Roundabout Name}RoundelInscribedCircle {Roundabout Name}RoundelIsland {Roundabout Name}RoundelMergeLine {Roundabout Name}RoundelSecondaryCirculatoryCrown {Roundabout Name}{Arm Name}Alignment {Roundabout Name}{Arm Name}Crown {Roundabout Name}{Arm Name}NearsideKerb
The following profiles on specified layers:
Name
The profile names are prefixed with the alignment name:
{Alignment name}AdjustedLevels {Alignment name}FixedLevels {Alignment name}{Surface Name}
Layer
{Roundabout Name}AdjustedProfiles {Roundabout Name}FixedProfiles {Roundabout Name}SurfaceProfiles
The following assemblies on layer {Roundabout Name} Assemblies:
{Roundabout Name}RoundelApron {Roundabout Name}RoundelCirculatoryCrown {Roundabout Name}{Arm Name}Crown
A corridor named:
{Roundabout Name}