There is a lot traffic in Taipei, and as you can see they have built complex roads for it. And notice the scooters in the foreground. There are a lot of scooters in Taipei and other Taiwanese cities. Like here they often have a lane on their own. And it appears that they often have a lane permitting them going the other direction on one-way streets. Not that scooter drivers appear to care too much about rules. As long there is not physical obstacles, they can drive about anywhere, it seems.