AutoCAD Civil 3D 2017 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}