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Hammersmith Flyover

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Hammersmith Flyover
Location Map ( geo)
Hammersmith Flyover - Geograph - 1091630.jpg
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Highway Authority
Transport for London
Junction Type
Grade-separated gyratory
Roads Joined
A4, A219, A306, A315
Junctions related to the A219
Junctions related to the A306
Junctions related to the A315

The Hammersmith Flyover flies over a busy gyratory in Hammersmith. In December 2011, the flyover itself was closed due to being unsafe and in desperate need of repairs.


The idea of a grade separated crossing of the surface streets below what is now the Hammersmith flyover was first suggested in the late 1940s, however at this point the idea was to build a tunnel under the streets. It soon became apparent, however, that this would not be possible. The main issue was that the tunnel would have to cross beneath London Underground tracks which are in a cutting in the area, and the water table was only a few metres below the level of this cutting, which rendered a tunnel unfeasible.

It was then decided that a flyover should be built, and in 1956 the Ministry of Transport announced it would provide a grant to cover the cost of building the flyover.

The flyover was designed as the first in the UK supported only by central columns. The rationale behind this was that in order to build supporting columns in the conventional fashion, far more land would have had to have been acquired which would have made the project far more expensive.

The flyover was built by Marples, Ridgeway & Partners between 29th February 1960 and 16th November 1961 when it was opened to traffic by Harold Shearman, Chairman of London County Council. Ernest Marples, Transport Minister, was in attendance and declared that it "marks a new age in road planning" and that "it is quite the nicest flyover I have seen in the world". Cost was £1.3 million.

The 2,800 yard dual 24 foot carriageway connected the adjacent sections of the Cromwell Road Extension and the 1,000 yard flyover was supported by 15 tapering columns. It involved a new type of prestressed concrete construction with the precast sections "stitched together" with 33 miles of high tensile steel strands. It had 66 miles of electric cable for de-icing buried below the road surface.


The area in 1960
The flyover shown in June 1962.

Closure and Repairs

The flyover was inspected during December 2011. This inspection found that cables within the structure were severely corroded. The flyover was closed for safety reasons and work soon began to strengthen the most damaged parts of the flyover in order for it to reopen in time for the 2012 Olympic Games.

Work is currently (As of September 2014) to strengthen the remainder of the structure.


The work to strengthen the flyover will mean it can remain in use for many years. In the longer term, plans exist to transfer the flyover to a tunnel. These plans were supported by Mayor of London, Boris Johnson, in March 2014.


Route To Notes


The WEST, Heathrow Airport


Central London, Olympia


Shepherd's Bush




Hammersmith, Barnes





Hammersmith Flyover
Related Pictures
View gallery (7)
13. Hammersmith - Coppermine - 1855.JPG14. Hammersmith Flyover - Coppermine - 1854.JPGHammersmithFlyover.JPG20160411 0905 - Hammersmith Flyover - 51.4911449 0.2259483W.jpg20160411 0854 - Hammersmith Flyover with Queen Caroline St Below - 51.4913891N 0.224584W.jpg
Junctions on the A4
Monument • Ludgate Circus • Holborn Circus • Trafalgar Square • Charing Cross • Piccadilly Circus • Hyde Park Corner • Scotch House • Hammersmith Flyover • Hogarth Roundabout • Chiswick Roundabout • Brentford • Gillette Corner • Henlys Roundabout • Waggoners Roundabout • Harlington Corner • Concord Roundabout • Moor Junction • Langley • Huntercombe Spur • The Thicket • Sutton Seeds • Theale • Robin Hood Roundabout • Kings Roundabout • Canal Roundabout • Webbington Roundabout • Bridge Roundabout • Rowden Roundabout • The Pheasant • Meuthen Park • Chequers • London Road Junction • Twerton Fork • The Globe • Broadmead • Hicks Gate Roundabout • Bath Bridge • Temple Circus • Cumberland Basin • Lawrence Weston Interchange (Portway Roundabout • St Brendans Roundabout) • St Andrews Gate Roundabout

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