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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.
Drafting cars who stick to the 20mph limit in Richmond Park has really made me question the accuracy of my Garmin.