A408 clockwise Stockley Road Roundabout to M4 southbound Jct 4 link road closure

Cleared

Start time: Thu, Oct 16, 2025 9:00 PM
Expected end: Fri, Oct 17, 2025 4:30 AM
Duration: 7 hours 30 minutes
Road: M4 – M4 Fast Slip From A408 Southbound To M4 J4 Eastbound Access
Category: Road Maintenance
Direction: Eastbound
Carriageway: Dual Carriageway
Reason: Roadworks

Live incident

Active roadworks

Planned

Cleared

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First published: Thu, Oct 16, 2025 8:52 PM
Last updated: Fri, Oct 17, 2025 12:03 AM
Cleared: Fri, Oct 17, 2025 4:30 AM

Latest update: A408 clockwise Stockley Road Roundabout to M4 southbound Jct 4 link road closure

Coordinates: 51.496659, -0.452682
Latitude span: 51.496046 – 51.497331
Longitude span: -0.452963 – -0.451972
Bounding box centre: 51.496689, -0.452468
Location descriptions: M4 fast slip from A408 southbound to M4 J4 eastbound access

connector at A408/M4 J4/M4 spur (Heathrow)

Feed validity status: Active
Overall feed start: Thu, Oct 16, 2025 9:00 PM
Overall feed end: Fri, Oct 17, 2025 4:30 AM
Feed window length: 7 hours 30 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

9 coordinate pairs

Description: M4 fast slip from A408 southbound to M4 J4 eastbound access
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: {71F83347-4EB9-4DB1-A17A-78DAC2794214}
Linear Element Type: B Carriageway Entry Slip
From Distance: 0 m
To Distance: 116 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.496817 -0.452963
51.496628 -0.452912
51.496528 -0.452858
51.496446 -0.452789
51.496401 -0.452747
51.496327 -0.452634
51.496152 -0.452309
51.496072 -0.452094
51.496046 -0.451972

Segment 2

3 coordinate pairs

Description: connector at A408/M4 J4/M4 spur (Heathrow)
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: {4D731291-3572-4B19-9B42-7DB998A0EED5}
Linear Element Type: A Carriageway Entry Slip
From Distance: 15 m
To Distance: 36 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.497331 -0.452735
51.497309 -0.45276
51.497176 -0.452908

Segment 3

2 coordinate pairs

Description: connector at A408/M4 J4/M4 spur (Heathrow)
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: {B06FAF47-694E-410E-B7C6-A146411D6DC8}
Linear Element Type: A Carriageway
From Distance: 0 m
To Distance: 40 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.497176 -0.452908
51.496817 -0.452963

Geometry type: MultiLineString
Geometry points: 14
First coordinate pair: -0.452963, 51.496817
Road section segments: 1
Road section points: 14

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.452963,
                51.496817
            ],
            [
                -0.452912,
                51.496628
            ],
            [
                -0.452858,
                51.496528
            ],
            [
                -0.452789,
                51.496446
            ],
            [
                -0.452747,
                51.496401
            ],
            [
                -0.452634,
                51.496327
            ],
            [
                -0.452309,
                51.496152
            ],
            [
                -0.452094,
                51.496072
            ],
            [
                -0.451972,
                51.496046
            ],
            [
                -0.452735,
                51.497331
            ],
            [
                -0.45276,
                51.497309
            ],
            [
                -0.452908,
                51.497176
            ],
            [
                -0.452908,
                51.497176
            ],
            [
                -0.452963,
                51.496817
            ]
        ]
    ]
}

View road section coordinates

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