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The M12 motorway was a planned motorway starting in north-east London and joining the A12 road in Essex. The 1960s scheme would have started at a junction with the M11 motorway and North Circular and ended near Brentwood, Chelmsford, or at the proposed new Maplin Sands airport; the motorway was part of the ambitious London Ringways plan to build motorways throughout London. Although most of the Ringways plan was cancelled in 1973 the M12 motorway project was still included in the Roads for Prosperity white paper published in 1989 along with major proposed developments to the A12 road. It was not formally cancelled until 30 March 1994 by the Secretary of State for Transport, John MacGregor. ==Routes== There were three main route proposals: #South Woodford () to Brentwood () #South Woodford to a proposed new London Airport at Maplin Sands #South Woodford (or M25 motorway) to Chelmsford The motorway would have started in South Woodford creating a junction with the North Circular at the start of the current M11 motorway. It was intended that the North Circular would also be upgraded as Ringway 2 to motorway standard around London and be designated as the M15 motorway. It was also intended that the M11 would continue further into London joining Ringway 1 and then into Islington as 'Eastway'. Due to the cancellation and the scaling back of London Ringways during the 1970s, few these ambitious plans were realised except of East Cross Route which was part of Ringway 1 and the M11 Link road (designated as the A12) which was opened in 1999 despite considerable opposition from the M11 link road protest. Land was set aside for the later construction of the M12 interchange when the southern end of the M11 was constructed in the 1970s – the current carriageways of the M11 at the junction with the A406 would have been slip roads between these two routes. The start of the M12 would have been between the existing M11 lanes. Evidence for this can be seen on the ground: * Both the northbound and southbound carriageways of the M11 have stubs of slip roads leading to nowhere in the centre of the road at the point where the carriageways have diverged from one another. * The southbound carriageway has a flyover seemingly over nothing before it splits to join the North Circular Road. * Land immediately to the east of this bridge has been reserved and kept free of housing. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「M12 motorway (Great Britain)」の詳細全文を読む スポンサード リンク
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