https://communities.bentley.com/products/road___site_design/f/geopak-inroads-mx-openroads-forum/141197/detach-terrains-in-ss4I am a new-ish SS4 user. I have completed one project in SS4 and am starting my second. It is a 20 mile widening project. I ended up with multiple terrains in my design file and am unable to remove/detach them. My corridor is running slow, which I expecteden-USTelligent Community 12https://communities.bentley.com/thread/428730?ContentTypeID=1Thu, 28 Sep 2017 18:35:18 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:9558c4c0-e386-4b1a-b09d-7d9123ea0aabDawn Michel<p>Thank you.&nbsp; I have decided to use 10,000&#39; per corridor, each in different files.&nbsp; And yes, I have my terrains in separate files.&nbsp; Thanks for the input.&nbsp;</p><div style="clear:both;"></div>https://communities.bentley.com/thread/428573?ContentTypeID=1Wed, 27 Sep 2017 17:55:12 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:6a12cd55-e477-4050-a19c-cfc4561851f1Chuck K.<p>Michigan. I have a separate file per corridor to reduce problems down the road. As stated by Martin, I also reference my terrain into my corridor file. I also use a separate file for civil cells and reference that into the corridor.</p><div style="clear:both;"></div>https://communities.bentley.com/thread/428540?ContentTypeID=1Wed, 27 Sep 2017 15:17:27 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:22a59e7a-92a9-4571-9be3-a999852b8136Dawn Michel<p>Which state is that? &nbsp;I am working with ND. &nbsp;Do you use a different file for each corridor, or put several in one file?</p><div style="clear:both;"></div>https://communities.bentley.com/thread/428360?ContentTypeID=1Tue, 26 Sep 2017 11:26:23 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:fed07415-1e28-493b-9247-a73e8c3a3e4cMartin Y<p>You can only delete terrains from the Project explorer, so find your terrain in the project explorer, right click and delete from there.You may need to turn the rules on if it doesn&#39;t immediately delete. I would also recommend that you put the terrain models in another dgn and then reference them in to your main design dgn. They still work perfectly well when referenced in and aren&#39;t dumb references the way Autocad behaves.&nbsp;</p><div style="clear:both;"></div>https://communities.bentley.com/thread/428212?ContentTypeID=1Mon, 25 Sep 2017 12:20:20 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:698299ec-d5ed-4d1c-9348-66225f3a6333Chuck K.<p>FWIW our DOT came to the conclusion to model 2 miles max per corridor, anything longer than that could be problematic.</p><div style="clear:both;"></div>