We did a US trip recently, and in 5000k of driving on their major roads and highways through half a dozen states, we saw a total of 3 speed detection devices - all hand held by cops in patrol cars.
We get back to Brisbane and passed 2 speed cameras on the 30 minute trip home from the airport.
Speed is such a nothing burger when it comes to safe driving, yet it seems to be the only thing the police focus on.
A more cynical person might point out the fact that it's the easiest one to generate revenue from, and when budgets predict a rise in speed camera revenue year on year the focus is maybe not on safety.
They could pass laws fining people for anything, I think the reason speeding is the focus is because it's easy to enforce. You can't just point a radar gun at a lane of traffic and have it pick up all the fatigued or drunk drivers.
The people in charge tend to focus on what they can measure, regardless of how important it is.
This is completely incorrect, it is extremely simple to demonstrate that accidents increase with speed and also that such accidents are more likely to result in injury.
What you are alluding to are extremely misleading studies which do not separate fender benders as a separate category, since they are the most common collision and almost always happen due to congestion and distractions. Collisions where injuries occur are significantly more probable as speed goes up.