Which way is the best for a big design build project? Creating alignments in SS2 then importing to SS4. Or SS4 then exporting to gpk/alg?

All of the tools of Ss2 are in Ss4 and Ss10, except for the Roadway Designer, Express Modeler, Site Modeler and Cross Sections. You can mix InRoads Created Geometry with Civil Geometry, but you must be careful.

• Never assign an Auto Export Feature Definition to an imported from memory alignment.
• Never modify Civil Geometry imported from memory using Open Roads tool if you also want to be able to modify it in InRoads and then refresh it from InRoads memory.

Our workflow that we adopted was for very experienced InRoads users to manage all major alignments using InRoads and to import from memory whan needed in Open Roads. Then, use the Civil Geometry tools to layout any minor geometry - curb returns, traffic islands, turn lanes, etc. using the civil geometry tools so they are ruled to the major geometry. This allowed users to use and retain their InRoads skiles and knowledge while learning the Civil Geometry.

I agree. There's no reason to make any trips to SS2 if nobody is using it. I'd do it all in SS4.

3D modeling will be done using SS4 software, and yes we have subs that we work with. I know TxDOT will be moving to SS10 soon due to licensing. My main concerning was I don't see any benefit of creating SS2 then importing to SS4 when you can do everything so much better in SS4.

Which software is going to be used for the design? Do you have partners or subconsultants? What software will they be using? Perhaps you should coordinate that, and decide the rest after that.