On Sunday, November 20, 2016 at 8:16:54 PM UTC, Harry Bloomfield wrote:
Another John formulated the question :
Typically, instead of asking the local paper to notify readers that "the
road from A to B will be closed for X from DD ...", they have taken an
advert in the form of a Public Notice, and stated the po-faced bare
facts: "the C123 will be closed from its junction with the U456 to its
junction with the U987".

If you type into GoogleEarths search box c123 it will find the road and
zoom into to it.

Only if you're lucky. Unlike A and B roads, C road numbers are under the control of local authorities; there may be multiple instances of C123 or whatever. None of the C roads I know of show up on Google maps or Streetview.