Cadnam Interchange

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Cadnam Interchange
Location Map ( geo)
Start of M27.jpg
Cameraicon.png View gallery (2)
Highway Authority
Highways England
Junction Type
Roundabout interchange
Roads Joined
M27, A31, A336, B3079

Cadnam Interchange is junction 1 of the M27.

It is the only motorway junction inside a national park, though until the national park was created, the New Forest boundary skirted the junction. Despite being the western terminius of the M27, the junction has three lanes through it, but the A31 to the west is only two lanes. This creates a bottleneck where the 3-lane M27 and 2-lane on-slip merge into the 2-lane A31 in a short distance.

Until the end of the 1970s the junction was unnumbered, with junction numbering beginning at Ower.


Route To Notes


Southampton, Portsmouth, London For M3 Winchester, The Midlands


Ringwood For A348 Bournemouth, A349 Poole, The West


Cadnam, Copythorne, Ower For A336 Totton, A337 Lyndhurst, The New Forest


Brook, Bramshaw For B3078 Fordingbridge

Cadnam Interchange
Related Pictures
View gallery (2)
A31 eastbound M27 J1.jpgStart of M27.jpg
Junctions on the M27 and spurs
M27Cadnam • 2 Ower • 3 Rownhams • 4 Chilworth • 5 Stoneham • Townhill Park • 7 Hedge End • 8 Windhover • 9 Park Gate • 10 North Hill • 11 Wallington • 12 Paulsgrove • 12 Hilsea
Unbuilt M27:13 Portsbridge • 14 Farlington • 15 Broad Marsh • Langstone • Warblington • Fishbourne Roundabout
M271Redbridge • 1 Nursling • 2 Rownhams • Romsey Road
M275Paulsgrove • Hilsea • 1 Tipner • 2 Rudmore Roundabout
Other spursOwer Rdbt • Swaythling • Portswood • Bevois Valley • Western Terminal • Allington Ln Rdbt • Mousehole Rdbt
Junctions on the A31
Hogs Back • Shepherd and Flock • Hickley's Corner • Coxbridge Roundabout • Chawton Roundabout • Spitfire Roundabout • Bar End • Cadnam  • Rufus Stone • Stoney Cross • Picket Post • Forest Corner • Salisbury Road Junction • Ashley Heath Roundabout • Woolsbridge  Roundabout • Azalea Roundabout • Canford Bottom Roundabout • Red Post • Merley Roundabout