That's actually a common misconception.
It's not because Japanese ninjas are bad at being ninjas, it's just that other countries ninjas are completely invisible to the naked eye.
Obviously we all know we can see our own country's ninjas, but other countries are invisible.
Thanks to years of cultural import/export, most humans can naturally see Japanese ninjas.
So congrats, if you can see a Japanese ninja, you're actually just close to being a weeb.
Actual infrastructure dedicated for bicycles and other mobility options would nearly eliminate the "speed difference" issue in most cases.
A nearby city is ripping up one side of their main street and finally putting a physical barrier between the cars and the bikes.
Before it was just a painted line that got completely ignored, then it was the occasional traffic cone which kept getting stolen, then they tried those plastic bollards that are just hollow plastic, which just got run over.
It only took 3 deaths that I know of and countless children being injured.