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.
This is distinct from just a Speed Camera which is measuring over a very short interval from a single camera, the Average Speed Camera involves two or more cameras, recording people passing different points and working out how fast, on average, they must be travelling to have done so.
https://www.sciencedirect.com/science/article/abs/pii/S09666...
https://archive.strongtowns.org/journal/2021/9/9/improvement...
Some of you may die, but that's a price we're willing to make.