M4 southeast Jct 8/9 roundabout carriagway closure

Cleared

Start time: Tue, Jul 28, 2026 8:16 PM
Expected end: Wed, Jul 29, 2026 5:00 AM
Duration: 6 hours 14 minutes 1 second
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

Hover or tap markers for full details

Move Insights

Thinking of moving to this area?

Check flood risk, planning history, EPC ratings and more with a Move Insights property report.

Flood risk assessment

Planning history

EPC ratings & more

Get a property report

First published: Tue, Jul 28, 2026 8:16 PM
Last updated: Wed, Jul 29, 2026 12:58 AM
Cleared: Wed, Jul 29, 2026 2:30 AM

Latest update: M4 southeast Jct 8/9 roundabout carriagway closure

Coordinates: 51.499219, -0.722748
Latitude span: 51.498796 – 51.499686
Longitude span: -0.722932 – -0.722603
Bounding box centre: 51.499241, -0.722768
Location descriptions: roundabout at M4 J8/A404(M) J9/A308(M)

Feed validity status: Active
Overall feed start: Tue, Jul 28, 2026 8:16 PM
Overall feed end: Wed, Jul 29, 2026 5:00 AM
Feed window length: 8 hours 44 minutes
Probability code (raw): certain
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 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 2

4 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: 10 m
To Distance: 60 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499686 -0.722932
51.499648 -0.722903
51.499277 -0.722768
51.499253 -0.72276

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: 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: 35 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.499108 -0.722712
51.498892 -0.722609
51.498796 -0.722603

Geometry type: MultiLineString
Geometry points: 10
First coordinate pair: -0.722760, 51.499253
Road section segments: 1
Road section points: 10

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.72276,
                51.499253
            ],
            [
                -0.72272,
                51.499169
            ],
            [
                -0.722712,
                51.499108
            ],
            [
                -0.722932,
                51.499686
            ],
            [
                -0.722903,
                51.499648
            ],
            [
                -0.722768,
                51.499277
            ],
            [
                -0.72276,
                51.499253
            ],
            [
                -0.722712,
                51.499108
            ],
            [
                -0.722609,
                51.498892
            ],
            [
                -0.722603,
                51.498796
            ]
        ]
    ]
}

View road section coordinates

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