Where I live the speed has recently been reduced from 30 mph to 15 mph in an effort to make the area more livable. Roads have been narrowed with more room for trees, sidewalks and bike paths. As well as artificial choke points and high speed bumps, all in an effort to improve life for the people living there. This is done alongside an effort to create larger high speed roads around the area and push cars to use those, which are the long way around but since they are higher speed still faster.
However fucking idiots driving these huge trucks can just go across the speed bumps at 45 mph and they rush all the choke point no matter if they have the right of way or not. When such a huge thing comes rushing at you, you move out of the way. They also regularly cut across parts where cars aren't supposed to go. For example tight corners where the side walk is lower so larger delivery trucks and busses can still make the corner by cutting across the side walk a bit. Regular cars are supposed to just drive around them and in a regular car the kerb will make sure people don't normally do that. The big trucks however use them all the time as they don't even notice the kerb.
Since car brains experience the efforts to slow everything down as obstacles to overcome, more and more choose to drive these huge trucks and drive any speed and route they want. This actually goes against all the efforts to make the area better for pets, bicycles and people.
We desperately need max weight and size limits for cars.