Scotland

No idea. But that was not my intent. I would expect that 20mph would yield a decrease on the overall stats however

Also worth asking what the condition the roads themselves are in. Where I live in Edinburgh, and for probably a mile and a bit in all directions, the roads are more pothole than road. Add to that narrow roads to begin with, and the restrictions being done for traffic "calming." Just last week I nearly dislocated my shoulder when I hit a pothole at 10mph and the pitch cranked my front passenger side wheel way to the left...I just avoided smashing into the parked cars on the side. Normally in that stretch I would be a bit closer to the centre of the road, but with an Amazon delivery truck double parked and a bus passing it, I was only about a meter away from the parked cars. That isn't even in a stretch with a narrow road....