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The problem with 100% enforcement is it doesn't allow law enforcement any discretion, and then you end up having to actually officially change the speed limit which would probably never happen

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Definitely true in practice, but I don't think we want discretion. What I mean though is as a deterrent, you can either have a "fair" fine that's enforced 100% of the time, or 2x the "fair" amount with 50% enforcement, etc. When it's 100x the "fair" amount with 1% enforcement, and you see everyone else not being enforced, it feels unfair.

Traffic rules do require some discretion though - if eg you don’t allow crossing a double yellow line but a car is broken down blocking the lane, does that mean that the road is now effectively unusable until that car is towed? Lots of examples.

But I’m with you on more enforcement. I’m totally fine with automated traffic cameras and it was working great when I was in China - suddenly seemingly overnight everyone stopped speeding on the highways when I was in Shanghai, as your chances of getting a ticket were super high.

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