In my corner of the world it was the workers who demanded section control limiting speed to 70kmph in a segment of highway that was being renovated.
Authorities later said that they only went after 30% of the worst offenders, because otherwise the sheer number of tickets would be to high to process in a reasonable timespan.
Once word got out that the limit was actually enforced, speeds dropped. Now we have section control on some highways and personally I'm a fan, as I was always going around the speed limit anyway.
