Last year, the UK's Department for Transport (DfT) started to issue datasets for public use under the Open Government License.
Presented here is the latest data on planned roadworks on the UK Highway Agency's roads, distilled from the data files on this page. You can find information presented by road number, or search by location.
These are the outstanding roadworks from the 12 Mar 2012 data on the site, I will keep this page updated as new roadworks are posted on the DfT site, which is currently happening about every couple of weeks. Apologies to all who have been following this page, I have been too busy to update it for a while.
There are more information sets available, e.g. car parks and cycle routes, that I plan to look at, so please keep coming back for more.