M27

The M27 forms a bypass and distributor road for the urban sprawl along the south coast in Hampshire, from Portsmouth and Gosport to Southampton.

On the road, it often looks and feels every bit the long-distance, inter-urban motorway: fast, with a smooth alignment cutting across countryside and through woods, with widely-spaced junctions and mostly three lanes wide. But its appearance belies the fact that it's really of regional importance, linking up cities and towns around the Solent and filling up daily with commuters.

There's a good case for it to travel further east and west to help relieve the busy south coast trunk route, reaching Bournemouth and Brighton, but the motorway is constricted by the New Forest National Park in the west, whose guardians the Verderers are unwilling to see road building in the forest, and in the east by - er, nothing. The A27 continues from the M27's eastern end as a four-lane motorway-standard road. For no real reason, this remains part of the A27.

One of the reasons that Southampton and Portsmouth are linked by such a good road is that, in the 1970s as this motorway was being built, there were ambitious plans for a major New Town on the south coast between the two cities: Solent City would have been a vast new urban area, requiring good motorway access. The new city was, in the end, never built.

The M27 forms perhaps the most effective terminus of any London radial motorway. The M3 approaches Southampton via Basingstoke and Winchester, but it's stopped from crashing headlong into the city by the M27 which distributes its traffic east and west.

Start

Cadnam

End

Portsmouth

Passes

Southampton, Fareham

Connects to
Length

24 miles

Click a section name to see its full details, or click a map symbol on the right to see all motorways opened in that year.

Completed Name Start End
Cadnam - Ower J1 Cadnam J2 Ower Chronology map for 1975
Windhover - Park Gate J8 Windhover J9 Park Gate Chronology map for 1975
Ower - Chilworth J2 Ower J4 Chilworth Chronology map for 1975
Park Gate - Portsbridge J9 Park Gate J12 Portsbridge Chronology map for 1976
Hedge End - Windhover J7 Hedge End J8 Windhover Chronology map for 1978
Stoneham - Hedge End J5 Stoneham J7 Hedge End Chronology map for 1983
Chilworth - Stoneham J4 Chilworth J5 Stoneham Chronology map for 1984

Exit list

Symbols and conventions are explained in the key to exit lists. You can click any junction to see its full details.

Junction   Westbound               Eastbound  
1
1.6 km
Lyndhurst
A337
Bournemouth
Ringwood
A31



A337
WEST
A31



B3078
N/A
LanesLanesLanesLanesLanes Signs LanesLanesLanesLanes Signs
3 miles, 3 lanes 3 miles, 3 lanes
2
7 km
Salisbury
Bath
A36
A326 A36 Romsey
(A3090)
Salisbury
A36
LanesLanesLanesLanesLanes LanesLanesLanesLanesLanes
2 miles, 3 lanes 2 miles, 3 lanes
3
10.7 km
Southampton Vehicle Ferry
Totton
Romsey
M271 Link
M271 M271 Southampton Vehicle Ferry
Totton
Rownhams
M271 Link
LanesLanesLanesLanesLanesLanes LanesLanesLanesLanesLanesLanes
2 miles, 4 lanes 2 miles, 4 lanes
13 km Services Rownhams Services Rownhams
LanesLanesLanesLanesLanesLanes LanesLanesLanesLanesLanesLanes
1 mile, 4 lanes 1 mile, 4 lanes
4
15.2 km
M3 Winchester
Eastleigh
London
M3 Link
LanesLanesLanesLanesLanesLanes LanesLanesLanesLanesLanesLanes
1 mile, 2 lanes 1 mile, 2 lanes
4
17.3 km
Winchester
London
M3 Link
M3
LanesLanesLanesLanesLanesLanes Signs LanesLanesLanesLanesLanesLanes Signs
1 mile, 4 lanes 1 mile, 4 lanes
5
19 km
Eastleigh
Swaythling
Southampton Airport
A335
A335 A335 Swaythling
Southampton Airport
A335
LanesLanesLanesLanesLanesLanes Signs LanesLanesLanesLanesLanesLanes Signs
4 miles, 4 lanes 4 miles, 4 lanes
7
25 km
Thornhill
Hedge End
A334 (A27)
A334
(A27)
A334 Thornhill
Hedge End
A334 (A27)
LanesLanesLanesLanesLanesLanes Signs LanesLanesLanesLanesLanesLanes Signs
1 mile, 4 lanes 1 mile, 4 lanes
8
27.3 km
Sholing
Woolston
A27 (A3205)
(A27)
(A3205)
Sholing
Woolston
A27 (A3205)
LanesLanesLanesLanesLanesLanes Signs LanesLanesLanesLanesLanesLanes Signs
3 miles, 4 lanes  
River or canal River Hamble River or canal River Hamble
  3 miles, 4 lanes
9
32.5 km
Fareham (W)
Whiteley
A27
(A27) Fareham (W)
Whiteley
A27
LanesLanesLanesLanesLanesLanes Signs LanesLanesLanesLanesLanesLanes Signs
3 miles, 4 lanes  
10
37.3 km
Alton
A32
A32 A32
LanesLanesLanesLanesLanesLanes Signs
1 mile, 4 lanes 4 miles, 4 lanes
11
39.5 km
Fareham (Cen)
A27
Gosport
(A32)
(A27)
(A32)
Fareham (Cen)
A27
Gosport
(A32)
LanesLanesLanesLanesLanesLanes Signs LanesLanesLanesLanesLanesLanes Signs
3 miles, 3 lanes 1.5 miles, 4 lanes
41.8 km
LanesLanesLanesLanesLanesLanes
  1.5 miles, 3 lanes
12
45 km


M275
(A27)



Hilsea
Cosham
A27
Portsmouth
Continental Ferry Vehicle Ferry
M275 Link
LanesLanesLanesLanesLanes LanesLanesLanesLanesLanes
1 mile, 2 lanes 1 mile, 2 lanes
12
46 km
Portsmouth
Continental Ferry Vehicle Ferry
M275 Link
Cosham
Hilsea
A3
M275


A3





A27
EAST
A27

A3


LanesLanesLanesLanesLanes Signs LanesLanesLanesLanesLanes Signs
Routes
M27

Picture credits

  • Photograph of M27 at the interchange with the M3 is by Jim Champion.

With thanks to Robert Bollen, Nigel Le Poidevin, Steve, Dave McGuire, Clive and James Denson for information on this page.

In this section

What's new

We need to talk about Wisley

National Highways are spending a third of a billion pounds rebuilding one of the most congested junctions on the M25. Is it money well spent?

Oxford's Ground Zero

Oxford's Zero Emission Zone is just a trial, but transport policy in Oxford has become the catalyst for pitched battles and drawn in protestors from across the UK. What's happening to this genteel university town?

2023 end of year message

It’s been a quiet year for Roads.org.uk, but we will be back to our usual schedule soon.

Share this page

Have you seen...

Opening booklets

In days gone by, new roads were often celebrated with a grand opening ceremony and the issue of a commemorative booklet heralding the exciting new highway. You'll find some of them here, complete with a glimpse of all that empty tarmac and a healthy dose of modernist optimism.

About this page

Published

Last updated