Junctions that have evolved the most since classification

[Peter350]

I was looking at the wiki article on Alconbury North interchange and was intrigued by how much it has changed since roads were first classified in the area. This got me thinking, which junction has evolved the most since classification, or in other words, which junctions have had the most modifications done at different points in history?

These can range from wholescale rebuilds to minor layout changes and even renumberings, but must not include routine work such as resurfacing. Using Alconbury as an example, it has had seven modifications since roads were first classified, including classification itself.

1922 - A single road exists through the site of the junction with a sharp 45 degree bend and is classified A14.
1960s - Section of A14 north of the bend is incorporated into the A1 Alconbury bypass, with a new build section to the south. A trumpet junction is built at the site of the bend with the A14 to Huntingdon branching off.
1973 - Huntingdon bypass is built and reaches this junction, shortening the A14(N) to A1(S) slip road in the process.
1980s? - A1(N) to A14(S) loop closed. I think this was also when the A14 became A604 for a short while but not entirely sure.
Mid-1990s - A604 becomes A14 again.
1998 - A1 upgraded to A1(M) and junction completely rebuilt on a much larger scale. Access from A14(N) to A1(S) eliminated.
2019 - A14 becomes A1307.

For any example you use like the one above, you must start from the year the road was first built, or 1922 if the junction existed before then. Let’s see if we can beat this with 8 or more on the next post.

[JohnnyMo]

...1980s? - A1(N) to A14(S) loop closed. I think this was also when the A14 became A604 for a short while but not entirely sure.
...

This was when the A14 was duelled the S2 bridge became half of a D2
8 to beat ?

[vlad]

It all depends on how much detail you think is a change. Let's take Hanford Interchange, which has altered beyond recognition.

1922: The A449 runs north-south, meeting no other roads at the point just north of its crossing of the River Trent.
1930-ish: A road to the northeast, into Stoke, is built and numbered B5041 (or it may have been built a few years before).
1935: The A449 is renumbered A34.
1962: A road to the west (to the A519 and M6) is built, numbered A5006, and a roundabout is built.
mid-1960s: The B5041 to the northeast is renumbered A5006.
early 1970s: Another road to the northeast (to the A5007) is built, numbered A500.
1980-ish: The A5006 to the northeast is severed from the roundabout.
late 1980s: A flyover is built to separate A5006 to A500 traffic from the roundabout; the A5006 is renumbered A500 as a result.

I could mention putting in traffic lights, the construction (and later removal) of a pedestrian underpass and things that happened to the bridge over the River Trent - but none of those are actual road features.

[jervi]

Pease Pottage Interchange
1922 - A23 met Horsham road & Parish Lane in the village. S2
1960s - A23 widened to D2 passing just to the West of the village. Horsham Road & Parish Lane crossed the A23 at-grade. There are also tie-in from the old A23 to the north and south.
1975 - M23 appears. M23 to the north ties in to the A23 going to the south. New roundabout interchange built to provide access to the A23 (north to Crawley), arm also built that links to Horsham Road (via bridge) and Parish Lane
1980s? - New arm of the Western side of roundabout interchange. This lead to the Tollgate hill neighbour. appears it was originally single carriageway.
1990 - A23 to the south is shifted onto new alignment, new road added going south from the interchange as a service road (using existing access to Horsham Road / Parish Lane)
1996? - A264 Crawley Southern bypass built tying into the roundabout using the road that lead to Tollgate Hill. Whole route is dual carriageway.
2008 - Parts of junction signalized.
2011 - New toucan crossing added adjacent on the A264 arm.
2020 - New housing development off the East side resulting in the whole roundabout being signalized as well as widened in places. Arm off the East side is widen to a D2 to a new roundabout which serves the service station and housing development.

[Big L]

The Cannock junction of the A5 and A34 has been through plenty in my living memory. Early 80s it was just a flat staggered crossroads with right-turn lanes in each direction, so that's probably at least version 2, and I recall that was converted to a double roundabout junction mid-80s.

It's worth having a quick read of the History section of the wiki for the rest.

[JohnnyMo]

My guess is Bignell’s Corner / South Mimms Interchange , something like:
1. Original A6/B650 T-Junction
2. 1st Barnet By pass 1926 A5092/A6 Cross Road
3. Renunbered as A555 in 1935 A555/A6 Cross Road
4. Renumbered as A1 1954?
5. A1/A6 Upgraded as Feeder to M1 1959? South Mimms Bypass & Roundabout added
6. A1178 Added mid 1970 ( aka M25)
7. A1(M) Jct1 – 2 May 1979 Cecil Road ?
8. A1178 renumbered as M25 Jun 1981
9. M25 J19- 23 Oct 86
10. Service Station Opened 1987

When was the GSJ built when was it signalised ?

[jabbaboy]

I honest can't give all of them but the mess at the South side of the Tyne Bridge in Gateshead / Eastgate Roundabout has to be up there, some of it though.

20's - Not sure on number, staggered junction for 2 non classified roads, straight to Swing Bridge
1928 - Tyne Bridge built, unsure on number
?? - Renumbered A1 (Used to go over High Level)
60's - Changed to roundabout and part of Gateshead flyover built.
70's - Renumbered A6144
70's to 00's - Changed from a roundabout, traffic lights, more lights, A184 / Askew Roadjoined the junction - really don't know the history here - someone fill the gap?
90's - Renumbered A167
00's - Loop around for Askew Road
00's - Lights to feed the traffic from the flyover / underneath towards Tyne Bridge
Late 2010's - No left turn onto Askew Road towards Tyne Bridge
2020 - Askew Road turned into bus lane
Future - Tyne Bridge and approach dropped to single lane in both directions.

Unsure on the history between the 70's and the late 90's but assume there's multiple changes and didn't mention the changes for High Street which went from 2 way, one way, two way, buses only throughout it's history. It's still a mess aswell.

[Steven]

It would be great if folk could help update the SABRE Wiki with some of this information, and using the {{mapbox}} template to show extracts from SABRE Maps to illustrate.