I would respond to the letter from Francis King (LTT 23 Jun) with several points:
The only truly safe 85th percentile vehicle speed for pedestrians and cyclists is zero mph in areas with no moving vehicles, but that is not realistic for commerce in many areas.
Having 20mph speed limiters in vehicles requires a significant and expensive infrastructure for both vehicles and the 20mph zones, to ensure that vehicles have 20mph actual maximum speeds in those, and only those, zones.
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