|Maintained by Highways England|
|Length||27.9 mi (44.9 km)|
J3 → M271 motorway
J4 → M3 motorway
J12 → M275 motorway
|Southampton, Fareham, Portsmouth, (Ringwood), (Bournemouth), (Poole), (Weymouth), (Salisbury), (Winchester), (Chichester), (Brighton)|
The M27 is a motorway in Hampshire, England. It is 27.9 miles (44.9 km) long and runs between Cadnam and Portsmouth. It was opened in stages between 1975 and 1983. It is unfinished, as an extension to the east was planned. A number of smaller motorways were proposed, connecting the city centres of Southampton and Portsmouth to the motorway; of these only the M271 and M275 were built. Three sections of the M27 have since been widened to four lanes each way, the first between Junctions 7 and 8, the second between Junctions 3 and 4, and the third begins at the slip road where Junction 11 joins until mid-way to junction 12.
Running approximately parallel both to the coast of the Solent and to the A27, the M27 starts as an eastwards continuation of the A35 from Dorchester and the A31 from Bournemouth and Poole, meets the A36 from Salisbury, crosses the Wessex Main Line railway, and then meets the M271 to central Southampton. After the M271, the road becomes a dual four lane motorway and passes Rownhams services, it then meets the M3, (two lanes going off, two lanes continuing to the other side of the junction) reverting to a dual three lane motorway as it passes to the north of Southampton, passes Southampton Airport, meeting Junction 7 and becoming dual four lanes again, then becoming dual three lanes after Junction 8, it then runs alongside the West Coastway Line as it heads south-east towards Fareham. It then runs alongside the northern outskirts of Fareham, briefly with a fourth climbing lane in either direction, before its junction with the M275 to Portsmouth. Very shortly after this point the motorway ends, becoming the A27, a four lane dual carriageway almost to motorway standards until the junction with the A3 (M) Motorway. The official reason for this section of road not being a continuation of the motorway is the hard shoulders being too narrow. Although the M275 which the M27 junctions with, has no official hard shoulders throughout its entire length.
The M27 was opened in stages (in common with many UK motorways) between 1975 and 1983.
- Junction 1 to 2 opened 20 August 1975
- Junction 2 to 4 opened in December 1975
- Junction 4 to 7 opened in 1983
- Junction 7 to 8 opened in February 1978
- Junction 8 to 12 opened in March 1976
The South Stoneham Crematorium, which was located north of South Stoneham Cemetery, was demolished during 1973 to make way for the construction of the M27 motorway. The South Stoneham garden of remembrance is now located at the north end of the cemetery, adjacent to the motorway.
It has been said that the M27 was intended as a motorway connecting south coast towns from Penzance to Ramsgate. However the only proposal of a route similar to that was by the Institution of Highway Engineers in 1936. Road developments in the New Forest are also restricted due to its national park status.
The M27 was meant to be extended to Chichester; a sign of this is the width of the A27 road between Junction 12 and the junction with the A3(M), which has 3-or-4 lanes, a hard shoulder and grade-separated junctions. It is not part of the M27 as its hard shoulders are not quite wide enough to comply with motorway regulations.
In November 2015, an elderly woman, Marion Munns, died after falling from the A3057 bridge that crosses over the M27, into westbound traffic, just before Junction 3. She had not taken her anti-psychotic medication, and escaped from her Southampton home through an upstairs window before climbing off the garage roof and running away.
Smart Motorway Conversion
In March 2018, work began to convert the section between Junction 11 and Junction 4 to a Smart motorway. The scheme will turn the hard shoulder into a permanent 4th running lane, adding refuge areas along the route and installing new CCTV and speed cameras with mandatory variable speed limit signs.
In early January 2019, official work began when average speed cameras were switched on between J5 and J4. Average speed cameras further along on the scheme will be turned on as work continues along the route. The work has suffered repeated delays and is now not expected to be complete until Spring 2022. 
Data from driver location signs are used to provide distance and carriageway identifier information. Where a junction spans several hundred metres (yards) and start and end points are available, both are cited.
|M27 motorway junctions|
|miles||km||Westbound exits (B carriageway)||Junction||Eastbound exits (A carriageway)||Coordinates|
|Road continues as A31 to The WEST, Weymouth, Poole, Bournemouth and Ringwood||Terminus
|Cadnam A336, Brook, Bramshaw B3079, Lyndhurst A337
|The New Forest, Cadnam, Lyndhurst A337
||Start of motorway|
|Salisbury A36, Fawley A326||J2||Salisbury, Romsey A36, Fawley A326, Paultons Park|
|Southampton, The Docks M271(S), Romsey M271(N)||J3||Southampton, The Docks M271|
|Rownhams Services (Roadchef)||Services||Rownhams Services (Roadchef)|
|The MIDLANDS, London, Winchester M3||J4||The MIDLANDS, London, Winchester M3|
|Southampton, Eastleigh, Airport A335||J5||Southampton, Eastleigh, Airport A335|
|Hedge End A334||J7||Hedge End, Botley A334|
|Southampton, Hamble, East Docks A3024||J8||Southampton (E), Hamble A3024|
|Fareham (W) A27, Whiteley||J9||Fareham (W) A27, Whiteley|
|Alton A32 (No access from A32 to M27)||J10||No exit|
|Fareham (C) A27, Gosport (A32)||J11||Fareham (C) A27, Gosport (A32)|
|Portsmouth, Ferries M275||J12||Cosham, Paulsgrove, Hilsea A27, Portsmouth (W), Ferries M275|
|29.0||46.6||Start of motorway||Terminus||No exit, access to A3 via J12|
|Cosham A3(N), Hilsea A3(S)||Road continues as A27 to Havant, Portsmouth (E), Chichester, Brighton and London (A3(M))|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
Junction 1 is about 1,800 metres (2,000 yd) (2,400 metres (2,600 yd) by road) from The Rufus Stone, where King William II, also known as William Rufus, was killed in what may have been a hunting accident in 1100.
- "M27 Portsmouth-Chichester". Pathetic Motorways.
- "Overall plans for the city". Retrieved 27 January 2007.[permanent dead link]
- "M27 – The South Coast Motorway and A3(M) Statistics and options". The Motorway Archive Trust. Archived from the original on 11 March 2007. Retrieved 27 January 2007.
- "South Stoneham Cemetery". Southampton City Council. 13 November 2009. Archived from the original on 16 May 2010. Retrieved 16 November 2009.
- Marshall, Chris; Le Poidevin, Nigel; McGuire, Dave; Denson, James; Steve; Clive. "CBRD Motorway Database – M27". Retrieved 30 September 2008.
- "Appendix A". The post war development of highways. Institution of Highway Engineers. 1943.
- Charlesworth, George (1984). "2". A history of British Motorways. London EC1: Thomas Telford Ltd. ISBN 978-0-7277-0159-6.CS1 maint: location (link)
- "M27 – The South Coast Motorway, M271, M275 and A3(M)". Archived from the original on 2 January 2007. Retrieved 25 January 2007.
The land acquired for this stretch of the motorway was not quite wide enough – by less than a foot – and the Chief Highway Engineer of the day, quite rightly if a little pedantically, ruled that it didn’t conform to motorway standards and must therefore be an all-purpose trunk road.
- "Pathetic Motorways".
- "Meon". Motorway services online. Retrieved 28 October 2009.
- Reporters, The Daily Telegraph (24 October 2016). "NHS care workers did not aid patient in crisis 'as staff about to go home'". The Telegraph.
- "Bridge fall death a 'wake-up call' for Southern Health". BBC News. 27 October 2016. Retrieved 12 October 2021.
- "M27 junctions 4 to 11: Smart motorway - Highways England". 15 May 2020.
- Area 3 Driver Location Signs (map) – Highway Authority, 2009
- As measured on Google Maps