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Most of those cars probably don't have cruise control and the drivers of the cars which do probably don't know how to use it properly
Cruise control and, more to the point, speed limiters are increasingly common. In my experience, I'm the only person in London who actually uses a speed limiter set (after calibration with GPS) at the posted speed limit.
Car speedometers may legally overread but not legally underread.
Since when did cars obey speedlimits?
Most of those cars probably don't have cruise control and the drivers of the cars which do probably don't know how to use it properly.