This is kind of how I would imagine it:
- a1paris-min.png (240.33 KiB) Viewed 3116 times
There are, however, some problems with this.
Currently, the A1 makes a sharp 150-ish degree turn left. If the A1 were to rebuild to Lille, you would want to get rid of the A29 and A26 in their current form.
The same goes for the A16 near the current A1. Also, the A3 is indicated on the signs at the Porte de Bagnolet (as it should), but there's no A3xA1 interchange. I'm afraid the scale won't allow it.
Now the next problem arises: Poissy is practically cut off from the rest of Paris, and the road network north-west of Paris looks kind of ugly. How would one go about solving that?