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if you think of "speed limit" as really an energy limit (mv^2) (and it is energy that kills, not speed), the equivalent to a 20mph ebike limit would be something like 3-5mph for a two-ton SUV.

You've got kids, who aren't anywhere near driving age, moving FASTER than traffic down sidewalks here Truly, ignorance is bliss, until they get splatted like a bug because nobody expects 30+ MPH stealth kids to appear from the sidewalk, you know, where people are usually at 3-5 mph