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Probably not evidence-based at all knowing most laws in the country
It's no longer the UK law but an EU directive--its status seems clear as mud, but perhaps this is useful:
https://leva-eu.com/2019/05/16/en-151942017-harmonized-under-machinery-directive-what-does-it-mean/
This is outdated but informative:
IIRC the UK law wasn't that different from the EU version, and I don't know what 'Brexit' is going to do about it.
Is anyone aware of research on the 15.5mph ebike speed limit? Rationale from the DFT for example.