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Henlys Corner

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Henlys Corner
Location Map
Henlys Corner - Geograph - 187659.jpg
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Type  : Forks. Traffic Lights
Roads Joined  : A1, A406, A598]]
Location  : Barnet
County : Middlesex
Junctions on the A1 London - Peterborough

A1(M) J10

Alconbury North Interchange

Alconbury South Interchange

Apex Corner


Bignells Corner

Black Cat Roundabout

Brampton Interchange

Coreys Mill Interchange

Fiveways Interchange

Highbury Corner

Langley Sidings Interchange

Lemsford Interchange

Letchworth Gate

Mill Hill Circus

Nags Head

Norman Cross

Oldings Corner


Roestock Interchange

Sawtry Interchange

Stirling Corner

The Clock Interchange

Junctions on the A598

Henlys Corner is situated at the interchange between the A1 / A406 North Circular Road and the A598 Regents Park Road / Finchley Road. It takes its name from the now defunct Henlys Garage once situated at the south-west side of the junction. Some people also include the two A1/A406 junctions situated a short distance east and west of the A598 as part of Henlys Corner.



At the time of the first world war, this part of north London was all but undeveloped, and the site of the junction was open countryside. The 1923 MOT map shows the A406 between Staples Corner and the A598 Regents Park Road as under construction, the final approach to the A598 being the present Charter Way. The 1926-28 MOT map shows this section complete, with the A406 to the east, the A1 Falloden Way and the A1 Great North Road shown as in the course of construction. According to the 1935 half inch map the present A1 Great North Road was then designated A5093. It can therefore be deduced that the junction opened in the late 1920s.

Large scale Ordnance Survey mapping from the mid 1930s suggests that whilst the A598 was broadly as it is now, the A406 was single carraigeway. A search of on-line mapping suggests that the A406 wasn't dualled until the early 1970s, a layout that lasted until 2011.

As a trunk road, the junction was maintained by the Department for Transport and then the Highways Agency until the creation of Transport for London (TfL) in 1999.

The Tunnel Scheme

During the late 1980s and early 1990s, as part of a wider upgrade to the A406, the Department for Transport developed a scheme to grade separate Henlys Corner by constructing a cut and cover tunnel in the park land to the south of the A406. The tunnel would have carried A406 traffic under the existing junction which would have served the A1 and A598. Slip roads would have linked the buried A406 to the above ground junction.

Whilst some preliminary works were carried out to divert services, and land was obtained, the scheme itself was shelved in the early 1990s.

The 2011 Improvement

Henlys Corner experienced increasing congestion over many years, and as such TfL developed a scheme to provide improved capacity and pedestrian crossing facilities at the junction. The A406 was widened to provide 4 lanes in each direction between the two A1 junctions. Right turning vehicles from the A406 and A1 westbound into the A598 Regents Park Road now turn via a half-hamburger arrangement creating a displaced right turn. This removes right turning traffic from the middle of the junction, increasing vehicle capacity at the junction. The scheme was substantially complete at the end of December 2011.

Pedestrian Crossings

Prior to 2011 there had never been signalised pedestrian crossings at Henlys Corner. As the junction is located close to one of the largest Synagogues in London, the inclusion of hands free pedestrian crossings was widely reported in the media. Newspaper report.


Route To Notes


The NORTH, Watford, Mill Hill, Hendon, (M1)


Central London, Holloway


North Circular (A41, A40), Brent Cross


N.Circular (A10, M11), Wood Green




Walthamstow, Finsbury Park

Henlys Corner
Junctions on the A1/A1(M)
London - Peterborough:
Angel • Highbury Corner • Nags Head • Archway • Henleys 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 • 9Letchworth Gate • 10 Junction 10 • Sandy • Black Cat • Wyboston • Brampton • 13 Brampton Hut • 13A Alconbury South • 14 Alconbury North • 15 Sawtry • 16 Norman Cross • 17 Fletton Parkway
Peterborough - Scotch Corner:
Wansford • Carpenders Lodge • Colsterworth • Gonerby Moor • Winthorpe • Tuxford • Markham Moor • Twyford Bridge • Apleyhead • 34 Blyth • 35 Wadworth Viaduct • 36 Warmsworth • 37 Ducker Holt • 38 Redhouse • 39 Barnsdale Bar • 40 Darrington • 41 Holmfield • 42 Selby Fork • 43 Hook Moor • 44 Bramham • 45 Grange Moor • 46 Junction 46 • 47 Allerton Park • 48 Aldborough Gate • 49 Dishforth • 50 Baldersby • 51 Leeming • Catterick South • Catterick Central • Catterick North • Scotch Corner
Scotch Corner - Edinburgh
56 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  • Fair Moor • Warreners House • Alnwick • Denwick • Spott Roundabout • Thistly Cross Roundabout • Abbotsview • Oaktree • Gladsmuir • Bankton • Old Craighall
Junctions on the North and South Circular Roads
North CircularChiswick Roundabout • Gunnersbury Park • Ealing Common • Hanger Lane • Park Royal • Stonebridge Park • Neasden Junction • Staples Corner • Brent Cross • Henlys Corner • Clockhouse Junction • Great Cambridge Junction • Angel Edmonton • Kenninghall • Cooks Ferry • Hall Lane • Crooked Billet • Waterworks Corner • Woodford • Charlie Browns • Redbridge • Ilford Bridge • Wallend • Beckton Roundabout • Gallions Roundabout
South CircularWell Hall Roundabout • Yorkshire Grey • Cliftons Roundabout • Catford Gyratory • Forest Hill • The Grove • Tulse Hill • Wandsworth Gyratory • Red Rover • Milestone Green • Chalkers Corner • Kew Green • Kew Bridge • Chiswick Roundabout