So here's my take on this.
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Prosecute reckless drivers, confiscate vehicles whether they are ebikes going 50 kmh on a sidewalk or pickups rolling coal.
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Somehow nobody cares about overpowered cars like overpowered ebikes. Why is selling a car that can go 240 or 400 kmh okay while selling a bike that can go 45 kmh not okay? IMO stopping both would be great.
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Performance limits in Watts are stupid. The limits are for rated power, which is completely arbitrary. The most common Bosch ebike motor sold here is rated at 250W, yet "peaks" at 800W, and can maintain that peak for hours. So what is even the point?