A1(M)/South Mimms - Baldock

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A1(M)
Location Map ( geo)
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South Mimms - Baldock
From:  South Mimms (TL224001)
To:  Baldock (TL233364)
Distance:  24 miles (38.6 km)
Meets:  M25, A1, A414, A505, A507, A602, A1000, A1001, A1081, A6129, B195, B197, B656
Former Number(s):  A1
Highway Authorities

Highways England

Counties

Hertfordshire • Middlesex

Route outline (key)
Arrownorth.jpg North Baldock - Alconbury
A1(M) South Mimms - Baldock
South Arrowsouth.jpg Central London - South Mimms
Junction List
Junc Northbound Southbound
1 Start of Motorway A1;M25, A1081
Services symbol.gif South Mimms services (at J1)
2 A1001 No Exit
3 A414 A414, A1001
Tunnel Hatfield Tunnel
4 A414 A414
Bridge Stanborough Bridges
5 No Exit No Exit
6 A1000 A1000
7 A602 A602
8 A602 A602
9 A505 A505
10 A1; A507 Start of Motorway
Services symbol.gif Baldock services (at J10)

South|North

Route

The A1(M) starts off underneath Junction 23 of the M25 as a continuation of the A1. Both the A1 and A1(M) at this point are D2/D2M. Heading roughly northwards, the road weaves for four miles to Hatfield, Junction 2. Approximately one mile further north, it becomes, at Junction 3 (the A414 west), a D3M and tunnels underneath 'The Galleria', a shopping mall. The tunnel is approximately 1,237 yards long and has recently (2011) been upgraded to include disabled egress in case of emergencies. Roughly ¾ mile from the tunnels north end, Junction 4 is encountered, the junction with the A414 eastbound. The road now passes between the village of Stanborough on the west side and Welwyn Garden City on the east side, and as it does so, it starts to climb up a relatively steep hill. Cresting the hill, it drops down to pass on the eastern side of Welwyn village and Junction 6. This junction is a spread out affair. Northbound, from the slip road exit to the slip road entry is a touch over a mile! Halfway between the exit/entry slip roads, the A1(M) now becomes a D2M, the cause of queues and delays in the evening peak period. Underneath the motorway at this point are the remains of a Roman bath, and to preserve it, a dome had to be built over the baths with the motorway passing over the top. The road now climbs again quite steeply, before descending down to pass on the west side of Knebworth village. Knebworth House is on the western side (your left heading North). Junction 7 is now encountered at the southern edge of Stevenage and the A1(M) now swings round northwestwards, then northeastwards, to skirt the town, and at the northern end of the town is Junction 8. The main road here (other than the A1(M) itself, of course) is the A602 heading westwards to Hitchin and Luton, and in the opposite direction, heading back into Stevenage. There are also a couple of minor roads leading to small villages either side of the A1(M). Just after Junction 8, the A1(M) yet again becomes a D3M for a little over 2 miles until it reaches Junction 9, the A505 east and west. It now gently weaves its way between Letchworth (on the west side) and Baldock (on the east side). 1.6 miles after passing underneath the Cambridge to London Kings Cross railway line, Junction 10 is encountered and the motorway now ends, continuing northwards as a D2.

History

Early improvements underway in the 1950s
Main Article: A1 Early Improvements
A series of bypasses where constructed through the 1950s and 1960s around the new suburban commuter areas of Middlesex and several market towns in the Midlands. These schemes massively reduced travel times on the Great North Road and provided vital relief for traffic-choked towns.

Improvements

1979: Hatfield-South Mimms

More details required.

1986: Hatfield Bypass

More details required.

Notable Locations

Hatfield. Birthplace of the de-Haviland Comet aircraft. Now home to the University of Hertfordshire. Has a shopping mall above the A1(M), the Galleria. Hatfield House, a large house and gardens often hosting concerts and the like.

Stevenage. A 50s/60s new town. Plenty of green spaces and a boating lake. The first Inter-City station out of Kings Cross on the ECML.

Future

The A1 is set to receive managed motorways between The Clock and Langley Sidings to increase the capacity of the road to three lanes in each direction.

In August 2016 a strategic report on the route was published.

Links

Roads UK

gov.uk




A1
SectionsA1(M)/Alconbury - Peterborough • A1(M)/Blyth - Adwick le Street • A1/Adwick le Street - Darrington • A1/Baldock - Alconbury • A1/Birtley - Morpeth • A1/Central London - South Mimms • A1/Dunbar - Musselburgh • A1/Morpeth - Dunbar • A1/Musselburgh - Central Edinburgh • A1/Peterborough - Blyth • A1/via Tyne Tunnel
ProjectsA1(M) Bramham to Wetherby • A1(M) Dishforth to Barton
JunctionsAlconbury South Interchange • Angel • Blue House Roundabout • Boot and Shoe Roundabout • Busby Stoop Roundabout • Catterick North Interchange • Catterick South Interchange • Eighton Lodge Interchange • Ferrybridge • Follingsby Interchange • Gainsborough Corner • Howdon Interchange • Lindisfarne Interchange • Neville's Cross • Racecourse Roundabout (Doncaster) • Scotch Corner • St Marys Roundabout (Doncaster) • St Pauls Gyratory
ServicesBaldock services • Barnsdale Bar services • Barton Park truckstop • Barton services • Blyth services • Brampton Hut services • Colsterworth services • Durham services • Ferrybridge services • Grantham North services • Kirby Hill services • Markham Moor services • Newark services • Peterborough services • Scotch Corner services • Seaton Burn services • South Mimms services • Sprotbrough services • Wansford services • Washington services • Wetherby services
CrossingsA1 Blaydon Bridge • A1 Bridge (East Linton) • Alnwick Viaduct • Berwick Bypass Bridge • Blaydon Bridge • Coquet Viaduct • Dunglass Bridge • Stainby Road Bridge • Stamford Bypass • Swing Bridge (Tyne) • Tempsford Bridge • Wansford Bypass Bridge • Wentbridge Viaduct • Winthorpe Bridge
RoadsA1 • A1(M)/Newcastle Central Motorway East • E104 (Teesside - Penrith) • E15 • E31 (via Carlisle) • E31 (via Newcastle) • Ermine Street • Holyhead Road • Peddars Way • T21 (Britain) • T24 (Britain) • T25 (Britain)
PlacesAlnwick • Barnet • Berwick-upon-Tweed • Boroughbridge • Central London • Edinburgh • Gateshead • Grantham • Haddington • Huntingdon • Morpeth • Newark-on-Trent • Newcastle upon Tyne • Peterborough • Pontefract • Potters Bar • Stamford • Stevenage • The City
Miscellaneous1924 A1 Renumbering • A1/Early Improvements • A1/Named Junctions • A1/Roaders Digest Entry • A1 London - Peterborough
Related Pictures
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A638 Doncaster.jpgAngel Islington 1970s proposal.pngBoroughbridge NPE.JPGGreat North Way 2 - Coppermine - 6514.jpgNoel Sims plot of land - Coppermine - 20333.JPG
Other nearby roads
HatfieldA1(M) • A1000 • A1001 • A1057 • A405 • A414 • A5092 (Barnet Bypass) • A555 (Barnet Bypass) • A6129 • B197 • B555 • B556 • B6426 • C119 (Hertfordshire) • C60 (Hertfordshire) • C91 (Hertfordshire) • E31 (via Newcastle) • Great North Road • Hatfield - Reading Turnpike • M100 • T102 (Britain) • T1 (Britain)
Welwyn Garden CityA1(M) • A1000 • A600 • A6129 • B1000 • B190 • B195 • B197 • B653 • B656 • C147 (Hertfordshire) • C148 (Hertfordshire) • C149 (Hertfordshire) • C152 (Hertfordshire) • C158 (Hertfordshire) • C182 (Hertfordshire) • C47 (Hertfordshire) • C91 (Hertfordshire) • M100 • T1 (Britain)
StevenageA1(M) • A1070 • A1070 (Fairlands Way, Stevenage) • A1072 • A1155 • A602 • B1037 • B197 • C171 (Hertfordshire) • C18 (Hertfordshire) • C20 (Hertfordshire) • C29 (Hertfordshire) • E31 (via Newcastle) • Great North Road • M100 • POLO • T1 (Britain)
LetchworthA1(M) • A505 • A5160 • A601 (Luton - Bourn Bridge) • A6141 • B656 • B656 (Willian) • B657 • C109 (Hertfordshire) • C10 (Hertfordshire) • C110 (Hertfordshire) • C112 (Hertfordshire) • C120 (Hertfordshire) • C145 (Hertfordshire) • C170 (Central Bedfordshire) • C19 (Hertfordshire) • C89 (Hertfordshire) • Icknield Way • M100
BaldockA1(M) • A505 • A507 • A5160 • A601 (Luton - Bourn Bridge) • A6141 • B197 • B656 • C10 (Hertfordshire) • C112 (Hertfordshire) • C144 (Hertfordshire) • C14 (Hertfordshire) • C7 (Hertfordshire) • C9 (Hertfordshire) • Icknield Way • M100
A1-A99
The First 99           A1  •  A2  •  A3  •  A4  •  A5  •  A6  •  A7  •  A8  •  A9  • A10 • A11 • A12 • A13 • A14 • A15 • A16 • A17 • A18 • A19
A20 • A21 • A22 • A23 • A24 • A25 • A26 • A27 • A28 • A29 • A30 • A31 • A32 • A33 • A34 • A35 • A36 • A37 • A38 • A39
A40 • A41 • A42 • A43 • A44 • A45 • A46 • A47 • A48 • A49 • A50 • A51 • A52 • A53 • A54 • A55 • A56 • A57 • A58 • A59
A60 • A61 • A62 • A63 • A64 • A65 • A66 • A67 • A68 • A69 • A70 • A71 • A72 • A73 • A74 • A75 • A76 • A77 • A78 • A79
A80 • A81 • A82 • A83 • A84 • A85 • A86 • A87 • A88 • A89 • A90 • A91 • A92 • A93 • A94 • A95 • A96 • A97 • A98 • A99
Motorway sectionsA1(M): (South Mimms - Baldock • Alconbury - Peterborough • Doncaster Bypass • Darrington - Leeming • Barton - Birtley)
A3(M) • A8(M) Baillieston spur • A14(M) • A38(M) • A48(M) Cardiff spur • A57(M) • A58(M) • A64(M) • A66(M) • A74(M) • A92(M)
DefunctA1(M) Newcastle CME • A2(M) Medway Towns Bypass • A4(M) • A5(M) • A8(M) Renfrew bypass • A14 • A18(M) • A20(M) • A36(M)
A40(M): (Westway • Denham -Stokenchurch) • A41(M) • A42 • A46(M) • A48(M): (Port Talbot bypass • Morriston bypass) • A62(M) • A88 • A99
UnbuiltA2(M) Rochester Way Relief Road • A6(M): (Western route • Eastern route) • A34(M) • A48(M) Llantrisant Radial • A59(M) • A61(M)