But then you end up with a lot of bikers hit by cars, because if you take a turn on the wrong side, you are practically invisible
I'll be moving there as soon as they re-open their borders, and I couldn't be more excited. It's cyclist heaven.
If you're asking about greenways, here's [1] an article with some pictures. There's an extensive network of bike-able paths throughout the entire city,
If you're asking about pollution, Japanese cars are generally smaller and I believe electric cars are popular there. More trips are also taken by train / bike / moped, reducing overall emissions. Also, the roads + signals seem to be designed well, so there is less stop-and-go traffic.
[1] https://taiken.co/single/tokyo-greenways-the-forgotten-paths...
If you see this in NL, the road is also closed for cyclists (in this direction): https://verkeersregels.vvn.nl/verkeersborden-en-tekens/c02
But if this modifier sign is put below, it's a two-way street for cyclists: https://verkeersregels.vvn.nl/index.php/verkeersborden-en-te...