[harambae]

I'll play devil's advocate on this one -- most motorcycles sold today will do 125mph and the Kei trucks I'm familiar with cruise at around 55mph reliably (some may technically go up to 65mph if you sit there redlining). I'd guess some concern comes from holding up single-lane traffic. And this is coming from someone who loves the Kei trucks in rural New Hampshire, but I have been stuck behind them before too.

Also motorcycles are a part of Americana history (there's no "Easy Rider" where two guys ride a Kei truck cross-country). I'm not at all sure motorcycles would be allowed if they just started popping up 10 years ago in the US, we've gotten risk averse in recent times.

[causality0]

A single lane road with a speed limit above 55 but no passing zones is a strange beast indeed. Don't think I've ever seen one. Also plenty of construction and farm equipment is street legal despite some of them not being able to break 25mph.

[fennecfoxy]

As always, it's a speed limit, not a speed target. Overtaking lanes exist for a reason. As long as someone isn't going unreasonably below the speed limit (which is also unsafe), then it's completely fine.