Don't scare the Horses!

[Refugee]

There are times when a speed limit is too low.
You can end up with a queue of drivers waiting to enter a low speed limit zone because the cars ahead simply can't get through without exceeding the speed so that the queue gets even longer.
You can see the effect on motorways when there is speed limited roadworks.
All you need to do is to look at traffic reports and then find the cameras over the section before the speed limit starts.
The cameras on tall white poles are on line.
https://www.motorwaycameras.co.uk/