The Clock Interchange

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The Clock Interchange
Location Map ( geo)
Derelict hotel on A1000 Welwyn - Geograph - 2536360.jpg
The Clock roundabout with the derelict remains of the hotel behind
Cameraicon.png View gallery (2)
Location
Welwyn
County
Hertfordshire
Highway Authority
Highways England
Junction Type
Unique
Roads Joined
A1(M), A1000, B197, B656
Junctions related to the A1000
Bell Bar • Ganwick Corner • High Road • Swanley Bar • The Rookery
Junctions related to the B197
Coreys Mill Interchange • Lemsford Interchange • The Airfield Roundabout

The Clock Interchange is junction 6 of the A1(M) in Welwyn, Hertfordshire. It also marks the northern terminus of the A1000 and intersects with the B197 (former A1 Great North Road). It takes its name from the now defunct Clock Hotel situated at the northern extremity of the junction.


History

Historically, the B1000 Hertford Road ran east-west through the site to its junction with London Road in Welwyn. When the Welwyn Bypass was built, the A1 bridged over the B1000 on the bridge presently carrying the B197. There were no links between the A1 and B197 at this time.

Eventually the two were joined by a pair of link roads to the north-west and north-east of the bridge, forming one of the earliest grade separated junctions. Further north, the Welwyn bypass joined the original Great North Road by the Clock Hotel.

In the early 1960s, one of the first stretches of A1(M) was built from the Clock towards Stevenage. This was a roundabout junction.

In the early 1970s the A1(M) Welwyn Garden City bypass was built and the interchange took the form we see today except the B1000 was renumbered to A1000. During the construction of this section of motorway, a Roman bath house was discovered along the line of the new motorway. The bath house was enclosed in a corrugated steel culvert and is regularly open to the public.


Routes

Route To Notes

A1(M)

The North, Stevenage

A1(M)

London

A1000

Welwyn Gdn City, Hertford

B197

Knebworth

B197

Stanborough

B656

Welwyn, Codicote
Welwyn Hertford Road



The Clock Interchange
Related Pictures
View gallery (2)
A1000 approach to A1(M) junction 6 - Coppermine - 4980.jpgDerelict hotel on A1000 Welwyn - Geograph - 2536360.jpg
Junctions on the A1/A1(M)
London - PeterboroughSt Paul's • Angel • Highbury Corner • Nags Head • Archway • Henlys Corner • Fiveways Corner • Mill Hill Circus • Apex Corner • Stirling Corner • Borehamwood • 1 Bignells Corner • 2 Roestock • 3 Roehyde • 4 Oldings Corner • 5 Lemsford • 6 The Clock • 7 Langley Sidings • 8 Coreys Mill • 9 Letchworth Gate • 10 Stotfold • Langford & Edworth Turns • Biggleswade South • Biggleswade North • Sandy • Black Cat • Wyboston • Hail Weston • Little Paxton • Buckden Roundabout • Brampton • Brampton Hut • Alconbury South • 14 Alconbury North • 15 Sawtry • 16 Norman Cross • 17 Fletton Parkway
Peterborough - Scotch Corner17 Fletton Parkway • Wansford • Carpenters Lodge • Wothorpe • Tinwell • Stamford • Tickencote • Bloody Oaks • Stretton • Colsterworth • Bridge End • Little Ponton • Spittlegate • Harlaxton Road • Barrowby • Gonerby Moor • Balderton • Coddington • Winthorpe • North Muskham • Carlton-on-Trent • Tuxford • Markham Moor • Twyford Bridge • Elkesley Junction • Apleyhead • Ranby • Blyth Flyover • 34 Blyth • 35 Wadworth Viaduct • 36 Warmsworth • 37 Ducker Holt • 38 Redhouse • Barnsdale Bar • 40 Darrington • 41 Holmfield • 42 Selby Fork • 43 Hook Moor • 44 Bramham • 45 Grange Moor • 46 Kirk Deighton • 47 Allerton Park • 48 Aldborough Gate • 49 Dishforth • 50 Baldersby • 51 Leeming • Catterick South • 52 Catterick Central • Catterick North • Scotch Corner • 56 Barton
Scotch Corner - Edinburgh56 Barton • 57 Blackwell Spur • 58 Burtree • 59 Aycliffe • 60 Bradbury • 61 Bowburn • 62 Carrville • 63 Blind Lane • 64 Vigo • 65 Birtley • 66 Eighton Lodge • 67 Coalhouse • 68 Lobley Hill • 69 Gateshead Quays • 70 Dunston • 71 Metro Centre • 72 Swalwell • 73 Derwenthaugh • 74 Scotswood • 75 Denton Burn • 76 Westerhope • 77 Kenton Bar • 78 Fawdon • 79 North Brunton • 80 Seaton Burn • Shotton Lane • Stannington • Clifton • St. Leonards • Fair Moor • Warreners House • Alnwick • Denwick • Charlton Mires • Chatton • Belford Station • Fenwick • Oxford • Scremerston Roundabout • East Ord Roundabout • Duddo • Duns Road • Highfields Roundabout • Cockburnspath Roundabout • Innerwick • Broxburn • Spott Roundabout • Thistly Cross Roundabout • Abbotsview • Oaktree • Gladsmuir • Bankton • Dolphinstone • Wallyford • Old Craighall • Newcraighall • Milton Link • East End