Paul Scott wrote:

I can think of a few sites on the motorway network where services have been
planned since the very start of construction, a good example is on the M27
at Fareham West, where the the westbound off slip is nearly a mile long
with further slip roads easily visible, and the eastbound on slip is
paralled by about half a mile of road for access to the future services.
Been there 30 years now so why do the Nimbys always seem so surprised?

Other planned (but unbuilt) sites for MSAs include:

Chigwell (Between Junctions 4 and 5 of the M11) - Site in use as a Works
Unit and Police Control Centre on the Northbound site

Staverton (Just South of Junction 10 of the M5) - Off slip "stub"
provided SB, on slip "stub" NB, still extant.

Moreton Valence (Between Junctions 12 and 13 of the M5) - Off slip
"stub" provided NB, on slip "stub" SB, still extant.

Harborough Magna (Between Junctions 1 and 2 of the M6) - Off slip
provided NB, on slip SB, still extant.

Doxey, nr Stafford (Between Junctions 13 and 14 of the M6) - All slips
constructed, MSA sites apparently screened by trees.

Newton-le-Willows (Between Junctions 22 and 23 of the M6) - All slips
constructed, EB site in use as Works Unit.

Basingstoke (Between Junctions 6 and 7 of the M3) - Off slip "stub"
provided SB, on slip "stub" NB, still extant. NB MSA site now a
residential area.

Cheers,

Barry