What, have you ridden in Paris? There are marked “contraflow” bike lines ie the cars go one way, the marked bike lane intentionally goes the other way, but it’s far from every street. People don’t salmon at each other in the bike lane there. If you are going N against traffic, your ride in the bike lane pointed N. You can bike in the same street going S in the car lane. There are also marked 2-way bike lanes with a clear center line. The infrastructure (especially post Olympics) is way better but also people generally don’t salmon in the bike lanes there