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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.

Ooh, a "rolling" speed limit depending on weight - now that's something smallish and sensible that could check growth of SUV sales perhaps? (thinking of Europe / Germany here).