M4 Jct 8/9 Roundabout carriageway closure (including all slip roads)

Cleared

Start time: Fri, Oct 10, 2025 8:00 PM
Expected end: Sat, Oct 11, 2025 5:00 AM
Duration: 9 hours
Road: M4 – M4 J8 Eastbound Exit
Category: Road Maintenance
Direction: Eastbound
Carriageway: Dual Carriageway
Reason: Roadworks

Live incident

Active roadworks

Planned

Cleared

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First published: Thu, Oct 9, 2025 8:32 PM
Last updated: Thu, Oct 9, 2025 8:52 PM
Cleared: Sat, Oct 11, 2025 5:00 AM

Latest update: M4 Jct 8/9 Roundabout carriageway closure (including all slip roads)

Coordinates: 51.499590, -0.718068
Latitude span: 51.499337 – 51.499734
Longitude span: -0.722888 – -0.713023
Bounding box centre: 51.499536, -0.717956
Location descriptions: M4 J8 eastbound exit

M4 J8 eastbound access

M4 eastbound between J8 and J7

Feed validity status: Planned
Overall feed start: Fri, Oct 10, 2025 8:00 PM
Overall feed end: Sat, Oct 11, 2025 5:00 AM
Feed window length: 9 hours
Probability code (raw): probable
Compliance option (raw): mandatory
Source identification (raw): roadworks

Management type value: carriagewayClosures (Carriageway Closures)
Contra-flow flag (raw): false
Width restriction flag (raw): false
Height restriction flag (raw): false
Weight restriction flag (raw): false

Segment 1

11 coordinate pairs

Description: M4 J8 eastbound exit
Lanes Restricted: 1 lane restricted
Operational Lanes: 0 operational lanes
Direction On Section: East Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {3FC76A8B-4B88-6629-A42A-5D71D3A9041C}
Linear Element Type: B Carriageway Entry Slip
From Distance: 0 m
To Distance: 439 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499694 -0.719357
51.499723 -0.718425
51.499704 -0.71743
51.49969 -0.71702
51.499655 -0.716264
51.499612 -0.715555
51.499525 -0.714433
51.49944 -0.713439
51.499426 -0.713259
51.499358 -0.71314
51.499341 -0.71311

Segment 2

11 coordinate pairs

Description: M4 J8 eastbound access
Lanes Restricted: 2 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: East Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {D8836978-BEA4-44BC-A754-31FDA1B0BC37}
Linear Element Type: B Carriageway Entry Slip
From Distance: 9 m
To Distance: 257 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499734 -0.722888
51.499705 -0.722789
51.499654 -0.722645
51.499615 -0.722471
51.499604 -0.722302
51.499612 -0.721928
51.49964 -0.721312
51.499672 -0.72062
51.499689 -0.72005
51.499692 -0.719703
51.499694 -0.719357

Segment 3

2 coordinate pairs

Description: M4 eastbound between J8 and J7
Carriageway: Dual Carriageway
Lanes Restricted: 4 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: East Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {24ABFEBB-4AB3-4668-830E-2F661F3C1F80}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 5 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499341 -0.71311
51.499337 -0.713023

Geometry type: MultiLineString
Geometry points: 24
First coordinate pair: -0.719357, 51.499694
Road section segments: 1
Road section points: 24

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.719357,
                51.499694
            ],
            [
                -0.718425,
                51.499723
            ],
            [
                -0.71743,
                51.499704
            ],
            [
                -0.71702,
                51.49969
            ],
            [
                -0.716264,
                51.499655
            ],
            [
                -0.715555,
                51.499612
            ],
            [
                -0.714433,
                51.499525
            ],
            [
                -0.713439,
                51.49944
            ],
            [
                -0.713259,
                51.499426
            ],
            [
                -0.71314,
                51.499358
            ],
            [
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                51.499341
            ],
            [
                -0.722888,
                51.499734
            ],
            [
                -0.722789,
                51.499705
            ],
            [
                -0.722645,
                51.499654
            ],
            [
                -0.722471,
                51.499615
            ],
            [
                -0.722302,
                51.499604
            ],
            [
                -0.721928,
                51.499612
            ],
            [
                -0.721312,
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            ],
            [
                -0.72062,
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            ],
            [
                -0.72005,
                51.499689
            ],
            [
                -0.719703,
                51.499692
            ],
            [
                -0.719357,
                51.499694
            ],
            [
                -0.71311,
                51.499341
            ],
            [
                -0.713023,
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            ]
        ]
    ]
}

View road section coordinates

Cause type: Road Maintenance
Detailed cause: Roadworks
Compliance: Mandatory
Probability: Probable
Validity status: Planned
Road management: Carriageway Closures