Hello Andrew,
Thank you for your response.
Yes you can convert your cad elements to MXRoad by using Auto conversion option in MXRoad. To convert your cad elements to MXRoad, please go to View> Toolbar > MX Conversion.
For more information, please refer the below link for your reference. Here I am converting AutoCAD elements to MXRoad. This process will convert any cad elements including MicroStation elements to MXRoad.
http://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki/25596.how-to-convert-cad-elements-to-mxroad-by-using-mx-conversion
Regards,
Purva Lakde