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M40 J3A

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M40 Junction 3A
Location Map ( geo)
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Abbey Barnes
Highway Authority
National Highways • Buckinghamshire
Junction Type
Roads Joined

Junction 3A on the M40 is one of several proposals to relieve Junction 4. It will provide west-facing slips that are lacking at Junction 3, giving Oxford/Birmingham-bound access to High Wycombe not reliant on Junction 4.

A link road (mostly an upgrade of Spring Lane) will link this junction to the A40 with a new bridge over the Wye.

Stub slips created for the unbuilt Abbey Barnes services might be reused for the junction. The slip roads will be long to allow uphill acceleration to 120 km/h and will hit Spring Lane about 200m apart, to maximise visibility for the junctions on Spring Lane.

The junction is estimated to cost £11,595,758


Route To Notes


Birmingham, Oxford, Marlow (A404)


London, Beaconsfield, Heathrow Airport (M25) no access from local road network
High Wycombe, Loudwater, Wooburn Green (A4094)
Flackwell Heath, Amersham & Wycombe College
Abbey Barn might be coupled with 'SLINK', to the A404 south of Handy Cross Interchange. However Rat-running potential has previously blocked the scheme.


M40 J3A
Other nearby junctions
High Wycombe
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

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