M4 Jct 8/9 Roundabout partial closure

Planned

Start time: Tue, Aug 11, 2026 8:00 PM
Expected end: Wed, Aug 12, 2026 5:00 AM
Duration: 9 hours
Road: M4 – Roundabout At M4 J8/A404(M) J9/A308(M)
Category: Road Maintenance
Direction: Clockwise
Reason: Maintenance Work

Live incident

Active roadworks

Planned

Cleared

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First published: Mon, Aug 10, 2026 8:08 PM
Last updated: Tue, Aug 11, 2026 2:56 AM
Cleared: Wed, Aug 12, 2026 5:00 AM

Latest update: M4 Jct 8/9 Roundabout partial closure

Coordinates: 51.499166, -0.722725
Latitude span: 51.498866 – 51.499571
Longitude span: -0.722875 – -0.722608
Bounding box centre: 51.499219, -0.722742
Location descriptions: roundabout at M4 J8/A404(M) J9/A308(M)

Feed validity status: Planned
Overall feed start: Tue, Aug 11, 2026 8:00 PM
Overall feed end: Wed, Aug 12, 2026 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

3 coordinate pairs

Description: roundabout at M4 J8/A404(M) J9/A308(M)
Lanes Restricted: 3 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start2 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {E7090E25-8578-401F-AA96-18717D4C806E}
Linear Element Type: Other
From Distance: 0 m
To Distance: 27 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499108 -0.722712
51.498892 -0.722609
51.498866 -0.722608

Segment 2

3 coordinate pairs

Description: roundabout at M4 J8/A404(M) J9/A308(M)
Lanes Restricted: 3 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start2 End2
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {F2A7AF7A-A196-4017-A7D4-6F590C95BF96}
Linear Element Type: Other
From Distance: 0 m
To Distance: 16 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499253 -0.72276
51.499169 -0.72272
51.499108 -0.722712

Segment 3

3 coordinate pairs

Description: roundabout at M4 J8/A404(M) J9/A308(M)
Lanes Restricted: 3 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End2
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {D007BE5B-7409-4277-A871-A294863AD990}
Linear Element Type: Other
From Distance: 24 m
To Distance: 60 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499571 -0.722875
51.499277 -0.722768
51.499253 -0.72276

Geometry type: MultiLineString
Geometry points: 9
First coordinate pair: -0.722712, 51.499108
Road section segments: 1
Road section points: 9

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.722712,
                51.499108
            ],
            [
                -0.722609,
                51.498892
            ],
            [
                -0.722608,
                51.498866
            ],
            [
                -0.72276,
                51.499253
            ],
            [
                -0.72272,
                51.499169
            ],
            [
                -0.722712,
                51.499108
            ],
            [
                -0.722875,
                51.499571
            ],
            [
                -0.722768,
                51.499277
            ],
            [
                -0.72276,
                51.499253
            ]
        ]
    ]
}

View road section coordinates

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