How to solve the feng shui problem of flushing the window in the master bathroom?

Judging from your description, there is no problem with this alone.

Because there is a garden with a certain space outside the window first, it is for the sake of fame, which can weaken the sense of suffocation. Even if there is a road rush, it doesn't matter. The trees and plants in the garden can be blocked by their own gas field.

And as you said, the road to the bathroom window is also blocked by a horizontal road, and cars pass by. This road has a strong airflow, so it's water. When the water stops, it won't pass. So you can rest assured on this issue. If you are really uneasy, you can put another pot of plants on the windowsill.

I hope it helps you.