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M27 J12

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M27 Junction 12
Location Map ( geo)
Cameraicon.png View gallery (19)
Location
north Portsmouth
County
Hampshire
Highway Authority
Highways England
Junction Type
unique
Roads Joined
M27, M275, A3, A27, A397
Junctions related to the A397

Junction 12 of the M27 is made up of three separate interchanges, each originally planned as three roundabout interchanges: one with the 'M274' spur to the A27 and A3, another with the M275 and a third with the A3. The creation of a free-flow M275 junction meant that the junction layout needed to be changed into one big junction.

This junction is home to two motorway multiplexes (which in and of themselves are rare) - the bits of motorway between the M275 and the A27 to Brighton, and the M275 and the A3/A27 crossroads, are both M27 and M275.

The signalised crossroads at the end of the spur was a large roundabout until 2005. Before the motorway opened, it was a much smaller roundabout.

Today the junction is known as Port Solent Interchange, after the marina which opened in the 1990s in one of the corners of the junction. During planning, it was treated as three separate junctions: the west trumpet being Paulsgrove Interchange, the core central section being Portsmouth Interchange and the eastern section being Portsbridge Roundabout. As a complex, it was referred to as (Portsmouth) Harbour Interchange.

Some maps show the junction being further south down the M275.

Routes

Route To Notes

M27

The WEST, Southampton, Fareham, Gosport

M275

Portsmouth, Ferries, Southsea & North End

A27

London (A3(M)), Portsmouth (E), Havant, Brighton

A3

Waterlooville, Cosham, Hospital, Paulsgrove

A3

Hillsea, North End, Fratton, Copner, Portsmouth (W), Ferries

A27

Fareham, Portchester, Superstore & Business Parks

A397

Waterlooville, Cosham, Highbury college, Southwick, London, Petersfield A397 number appears on one roundabout sign only
Western Road Industrial Estate Northarbour Road
IBM





M27 J12
Junctions
Crossings
Related Pictures
View gallery (19)
A27 Cosham traffic signals.jpgM27 J12 gantry.jpgM275 - Coppermine - 4229.jpgM27 J12, according to OS - Coppermine - 13802.JPGM27 J12 gantry roadworks.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
A27
Pevensey to LewesPevensey Roundabout • Golden Jubilee Roundabout • Cop Hall Roundabout • Eastbourne Road Junction • Berwick Roundabout • Beddingham Roundabout
Lewes to LancingSoutherham Roundabout • Ashcombe Roundabout • Falmer Interchange • Coldean Interchange • Hollingbury Interchange • Patcham Interchange • Devils Dyke Interchange • Hangleton Interchange • Holmbush Interchange • Adur Interchange • Sussex Pad
Lancing to ClaphamLancing Manor Roundabout • East Worthing Crossroads • Grove Lodge Roundabout • Offington Corner
Clapham to ChichesterClapham Interchange • Poling Corner • Crossbush Junction • Causeway Roundabout • Ford Roundabout • Danes Crossroads • Fontwell East Roundabout • Fontwell West Roundabout • Boxgrove Roundabout • Templebar Interchange
Chichester By-passResort Hotel Roundabout • Portfield Roundabout • Oving Crossroads • Bognor Road Roundabout • Whyke Roundabout • Stockbridge Roundabout • Fishbourne Roundabout
Incomplete M27Warblington Interchange • Langstone Interchange • Bedhampton Roundabout • Broadmarsh Interchange • Farlington Interchange • Port Solent Interchange
M27 J12 - M27 J11Paulsgrove Interchange • Castle Street Roundabout • West Street Roundabout • Cornaway Lane Roundabout • Condor Avenue Roundabout • Delme Roundabout • Wallington Interchange
M27 J11 - M27 J9Quay Street Roundabout • Station Roundabout • Titchfield Gyratory • Mill Lane Junction • St. Margarets Roundabout • Segensworth Roundabout • Park Gate Interchange
Junctions on the A3
Bank • Monument • Borough • Elephant & Castle • Kennington Oval • Clapham Common • Wandsworth Gyratory • Tibbets Corner • Roehampton Lane • Stag Lane • Robin Hood • Coombe Lane • Shannon Corner • Malden Corner • Tolworth • Hook • Esher Common • Painshill • Wisley • Ockham Park • Send • Burpham • Stoke • Wooden Bridge • University • Hogs Back • Compton • Shackleford • Milford • Thursley • Hazel Grove • Liphook • Griggs Green • Longmoor • Ham Barn Roundabout • Flexcombe • Sheet • Berelands • Weston • QE Country Park • Clanfield • 1 London Road • 2 Hazelton • 3 Hulbert Road • 4 Purbrook Way • 5 Bedhampton Roundabout • Broad Marsh • Spur Road Roundabout • Paulsgrove • Portsbridge Roundabout • Rudmore • Church Street Roundabout • Cambridge Junction