Ajax11 -
You don't mention which version of MicroStation or InRoads/InRoads Survey you are using?
Are you referring to displaying the Dynamic "Virtual" Graphics - or after you run "Survey to Graphics" - to write the graphic information to the DGN file?
Make sure the cell library - most likely provided by the same DOT who provided the InRoads preference file - is attached to your DGN file (and save settings).
If the InRoads preference file specifies a certain cell for a tree, that cell has to be available in MicroStation.
Hope this helps!
David Allen
Transportation CADD Manager
Pennoni Associates Inc.