Open Roads Mesh to Solid Conversion?

Hi all,

I've been trying to export a current Road Design completed in Open Roads (MX) to Navisworks via the DGN but Open Roads only seems to create a mesh, not a solid, which means it doesn't display correctly and other features like clash analysis don't work properly.

Is there a way to convert an Open Roads mesh into a solid? I've tried using the Microstation tools, i.e. Mesh to Solid, Convert to Solid, etc. but they don't seem to do anything.

Any help would be appreciated.

- Mark