I think the point of raising speed limits is to better match the natural safe speed for a road. The old 55 MPH limit was an over-correction because of high spee

I think the point of raising speed limits is to better match the natural safe speed for a road. The old 55 MPH limit was an over-correction because of high speed accidents. But over time roads were built better and cars became safer, so drivers felt more comfortable driving as fast as 75 MPH. And, I'm not sure but wasn't there some accidents caused by people suddenly decelerating when they saw a police car? Or am I thinking of the rear-end collisions because of red lights.