Yeah, the E4 is preferred over E45. Maybe the E6 in Norway is even better since Norway has so many electric cars but I’m quite sure that E6 is longer and it could be issues to go over from Norway to Sweden during the winter. If the weather is bad the roads from Norway to Sweden can be closed.

Are you thinking of the charging that some cities in the East of Europe have? Like this. As far as I know there is only a test track for that in Gävle or in Visby, one of the cities has the “tram-line” and the other has induction built into the road for charging. After searching I found this. But it is really short and I don’t even know if they still exist or have been removed. So no, it doesn’t help anything if you are driving from Copenhagen to Kiruna. It will definitely help but there are many other challenges with the solutions in Gävle and Visby, much higher cost for building the road, creates limitation for extreme transports like the towers for wind power plants, wear and tear and probably many other.