- Junction 1: London, A4, A406, A205.
- Junction 2: Brentford, A4.
- Heston service area.
- Junction 3: Hounslow, A312.
- Junction 4: West Drayton, Heathrow Airport. Junction 4A: Heathrow Airport, A4.
- Junction 4B: M25.
- Junction 5: Langley, A4.
- Junction 6: Slough, Eton, Windsor.
Membury services is a motorway service station on the M4 motorway, located on the original site of RAF Membury in the civil parish of Lambourn in the English county of Berkshire, close to the border with Wiltshire, 4 miles west of Junction 14.
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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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Junction 36: Bridgend, Sarn Park service area. Junction 37: Pyle, Porthcawl. Junction 38: Margam Park.
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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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Junction 8/9 near Maidenhead, Berkshire, and High Wycombe, Buckinghamshire is the only one in the UK with dual numbers.
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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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