
19. Join Duplicates together
-
Duplicates and original road shape (Plane) selected
-
3D View menu >> Object >> Join
Note:
- When you made the duplicates real, it made each duplicate a separate object.
- We want join the duplicates together and make the track one object.

20. Remove doubles
- Select joined duplicates
- 3D View menu >> Mode box >> Edit Mode
- 3D View menu >> Select >> (De)select All
- 3D View menu >> Mesh >> Vertices >> Remove Doubles
Note:
- When we joined the original road shape and Duplicates, it might have created vertices as doubles.

21. Clear Parent from track. Keep Transformation.
-
Select track shape (Plane)
-
3D View menu >> Mode box >> Object Mode
-
3D View menu >> Object >> Parent >> Clear and Keep Transformation