I am afraid to say, and has been already pointed out, that unless there is a willingness to enforce speeding it will continue.
A few years ago before the 20 mph speed limit was installed in the Manor Mount, St. David's Road, Waldenshaw Road area the council did a study on speeds. I remember there being concern that the average speed on Manor Mount was 44 mph. This was bad but what was even worst was the fact that that speed was by vehicles being driven the wrong way down the one way road!!
We then had one day of intense police action followed by the CCTV camera car popping up once a month.