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Ardley Interchange

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Ardley Interchange
Location Map ( geo)
The A43 approaching the northbound M40 - Geograph - 4273739.jpg
Cameraicon.png View gallery (1)
Highway Authority
National Highways
Junction Type
modified folded dumbbell
Roads Joined
M40, A43, B430
Junctions related to the B430
For detailed information about this topic, see Junctions

Ardley Interchange, often called Cherwell Valley Interchange, is junction 10 on the M40, linking to the A43.


Originally the junction was a standard dumbbell.

As part of the upgrade works on the A43 it was redesigned. The redesign is typically cited as a example par excellence of bad planning, as the two main flows (A43 to and from the M40 south of the junction) conflict, where they didn't before.

A Highways Agency study suggested that accident rates here have tripled in the five years since the junction was redesigned, as opposed to the rest of the A43 upgrade where they were reduced. The accidents are associated with higher vehicle speeds and driver congestion, which they suggest is because the M40 onslips are not on the sides drivers may expect them to be. The scheme, compromising of M40 J10 and the A43 as far as Baynards Green, aimed to deliver a cost/benefit ratio of 3.3. The actual measured value was -0.2.

In 2015 the conflicting southbound entry slip road was closed and the original slip road from the middle roundabout was reopened.


Route To Notes


Birmingham, Stratford, Warwick, Banbury


London, Newbury, Oxford


(M1), Northampton, Brackley, Milton Keynes (A421)


Middleton Stoney, Ardley

Cherwell Valley services

Cherwell Valley services


Ardley Interchange
Related Pictures
View gallery (1)
The A43 approaching the northbound M40 - Geograph - 4273739.jpg
Junctions on the M40
Denham Roundabout • 1A Denham Interchange • 2 Beaconsfield • 3 Knave's Beech • 3A Junction 3A • 4 Handy Cross • 5 Stokenchurch • 6 Lewknor  • 7 Three Pigeons • 8 & 8A Wheatley • 9 Wendlebury  • 10 Ardley • 11 Junction 11 • 12 Junction 12 • 13 Junction 13 • 14 Barford • 15 Longbridge • 16 Junction 16 •  M42 (3A) Umberslade
Proposed extension to M5: M42 3 Portway Island • M42 2 Hopwood Park • M42 1 Harvester Island • M5 4A Catshill • M5 4 Lydiate Ash
Junctions on the A43
Wolvercote Rdbt • Peartree • Ardley • Baynards Green Rdbt • Barleymow Rdbt • Evenly Rdbt • Brackley S Rdbt • Buckingham Rd Rdbt • Northampton Rd Rdbt • Welsh Ln • Dadford Rd • Abthorpe Rdbt • Tove Rdbt • Rothersthorpe • Lumbertubs Way • Broughton • Glebe Farm • Duddington Rdbt • Wothorpe

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