I understand the need for speed bumps in parking garages. We've all heard the screeching tires. And seen the Mario Andretti wannabees whipping around the corners at excessive speed.
It stands to reason that the higher the speed bump, the higher the deterrence factor.
But at some point, it also stands to reason, the law of diminishing returns comes into play.
I may not have a degree in civil engineering, but I would suggest that point has been reached: