A stepped lowering of Speeds limits, so people don't notice/object.
The one everyone is missing, is how 'normal' historic Speed Limits are being reduced (with little to no opposite, using "Experimental Planning Notices" (i.e. no authority to do so, no Safety reason) to make Camera Enforcement effective, by setting the bar low enough to "head clip" everyday drivers making slightest of mistakes.
They are removing the permissable margin of error. Why? because Speed enforcement/Speed Cameras make very good (regressive) revenue streams.