Grass GIS "v.in.ogr": How to prevent crossing lines from beeing split where they don't share a common node?

I want to import a road network into grass gis to run network analyses. I use "v.in.ogr" to import my road shapefile. The problem is that Grass GIS seems to split every crossing line no matter if they share a common node or not.

For a road network this is problematic for bridges or tunnels. How can I prevent the lines from being split? I'd like to preserve the line as in the following image:

Lines that belong together have the same id.

Which commands will lead to my desired result?