First, add the motorway base map to your diagram. Link your base map to a “grey motorway outlines” module. Then link this outlines module to displaying.
Open the parameters of the « outlines » module by double-clicking on it, then modify the color choosing a dark grey, and the thickness (this later depends on the scale with which you are working: entire France, region or province. Here, we have chosen a thickness of 1,5 km for the province of Hérault).
Add a second outlines module in the diagram (or duplicate the previous one with CTRL+C, CTRL+V) and rename it « red motorway outlines ». Then link this second outlines module to displaying.
Open the parameters of the outlines module by double-clicking on it, then modify the color, choosing a shade of darker or clearer red, and a thickness slightly finer than the outline of the grey outline (here, we have entered a 1 kilometer thickness).
You can also realize the same operation with a second road base map, watching over to adapt the thickness and the color.
Example :
Grey outlines for roads
Orange outlines for roads
In your displaying module, you can modify the order of appearance of the layers in order to make the motorways appear above or below the roads upon your convenience.
Final result :
Zoom :
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