The one just over the bridge going to hawk green is the worst one - it seems to be much higher than the others - and honestly seems to be more than just a traffic calmer - it's going to take someones exhaust off shortly. The idea of calming is a good one - but I'm sure there are better ways. In Disley - there are islands that come out into the road on each side, making a chicane effect - surely that would be a bit safer, and a bit more picturesque.
Osdog