Race Track -- DupliFrames

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