Why does the M4 have junction 8 and 9?

Junction 8/9 near Maidenhead, Berkshire, and High Wycombe, Buckinghamshire is the only one in the UK with dual numbers. This arose at the time when the M4 turned north near junction 8, where it met the A308, and headed for the original junction 9, where the motorway ended at a roundabout interchange with the A4.



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By October 2007, any hopes of junction 31 finally being built were dashed when Cardiff Council denied the planning application and renewed plans for the Thornhill interchange were abandoned.

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The M4 is the most heavily used transport link between the main urban centres in the Severn Estuary of Swansea, Bridgend, Cardiff, Newport and Bristol. The M4 Corridor around Newport also plays a key role in facilitating the movement of commuters through South Wales.

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M4 J12 Theale Interchange | Roads.org.uk.

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Pincents Kiln Industrial Park is off Bath Road when travelling from Reading, near to junction 12 of the M4 motorway. From the motorway junction take the A4 Reading turn off and take the first left turn into the Pincents Kiln Industrial Park. The road is arrow marked IKEA.

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Answer: A motorway just relates to the A road that it's relieving pressure from. The reason there is no M7 is that the A7, which runs from Carlisle to Edinburgh has no need for a motorway to relieve it.

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When the M1 was upgraded to four lanes between the M25 and Luton, the M10 was killed off. Collector-distributor roads were built alongside the M1, and the A414 was routed on what was the M10, up the parallel carriageways alongside the M1 and off to join the next section of A414 at junction 8.

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Junction 8/9 near Maidenhead, Berkshire, and High Wycombe, Buckinghamshire is the only one in the UK with dual numbers.

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The M4 motorway (junction 24 (Coldra) to junction 28 (Tredegar Park), Newport) (temporary speed restrictions) Order 2021 | GOV.

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M4 westbound traffic wishing to access the A34 is advised to exit at junction 12 and travel west along the A4; and M4 eastbound traffic wishing to access the A34 is advised to exit and junction 14 and travel east along the A4.

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