M4 eastbound Jct 21 to 20 - lane closures

Cleared

Start time: Mon, Jun 15, 2026 8:00 PM
Expected end: Tue, Jun 16, 2026 5:00 AM
Duration: 2 seconds
Road: M4 – M4 Eastbound Between J21 And J20
Category: Construction Work
Direction: Eastbound
Carriageway: Dual Carriageway
Lanes affected: 2 of 2 lanes affected, 2 of 1 lanes affected
Reason: Road Improvement Or Upgrading

Live incident

Active roadworks

Planned

Cleared

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First published: Mon, Jun 8, 2026 7:00 AM
Last updated: Mon, Jun 15, 2026 6:47 PM
Cleared: Mon, Jun 15, 2026 8:00 PM

Latest update: M4 eastbound Jct 21 to 20 - lane closures

Coordinates: 51.559394, -2.559119
Latitude span: 51.556648 – 51.561334
Longitude span: -2.561570 – -2.556376
Bounding box centre: 51.558991, -2.558973
Location descriptions: M4 eastbound between J21 and J20

M4 eastbound within J20

Feed validity status: Planned
Overall feed start: Mon, Jun 15, 2026 8:00 PM
Overall feed end: Tue, Jun 16, 2026 5:00 AM
Feed window length: 9 hours
Probability code (raw): probable
Compliance option (raw): mandatory
Source identification (raw): roadworks

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

Segment 1

6 coordinate pairs

Description: M4 eastbound between J21 and J20
Carriageway: Dual Carriageway
Lanes Restricted: 2 lanes restricted
Operational Lanes: 2 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: {BBCF13CD-84AD-4542-B91E-D5E3F80455EE}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 325 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.559898 -2.559545
51.559388 -2.55895
51.558879 -2.558366
51.558404 -2.55787
51.558351 -2.557826
51.557446 -2.556984

Segment 2

2 coordinate pairs

Description: M4 eastbound within J20
Carriageway: Dual Carriageway
Lanes Restricted: 2 lanes restricted
Operational Lanes: 1 operational lane
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: {28ED533E-2B58-4717-A7A3-2B792A8EAEAA}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 98 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.557446 -2.556984
51.556648 -2.556376

Segment 3

7 coordinate pairs

Description: M4 eastbound between J21 and J20
Carriageway: Dual Carriageway
Lanes Restricted: 2 lanes restricted
Operational Lanes: 2 operational lanes
Direction On Section: East Bound
Direction Relative: Aligned
Height Grade: Start2 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {851BB8E6-6940-4369-BCF5-A96FE8932F11}
Linear Element Type: B Carriageway
From Distance: 885 m
To Distance: 1,098 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.561334 -2.56157
51.561086 -2.561178
51.560881 -2.560872
51.560732 -2.560668
51.56038 -2.560188
51.560139 -2.559868
51.559898 -2.559545

Geometry type: MultiLineString
Geometry points: 15
First coordinate pair: -2.559545, 51.559898
Road section segments: 1
Road section points: 15

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -2.559545,
                51.559898
            ],
            [
                -2.55895,
                51.559388
            ],
            [
                -2.558366,
                51.558879
            ],
            [
                -2.55787,
                51.558404
            ],
            [
                -2.557826,
                51.558351
            ],
            [
                -2.556984,
                51.557446
            ],
            [
                -2.556984,
                51.557446
            ],
            [
                -2.556376,
                51.556648
            ],
            [
                -2.56157,
                51.561334
            ],
            [
                -2.561178,
                51.561086
            ],
            [
                -2.560872,
                51.560881
            ],
            [
                -2.560668,
                51.560732
            ],
            [
                -2.560188,
                51.56038
            ],
            [
                -2.559868,
                51.560139
            ],
            [
                -2.559545,
                51.559898
            ]
        ]
    ]
}

View road section coordinates

Cause type: Construction Work
Detailed cause: Road Improvement Or Upgrading
Compliance: Mandatory
Probability: Probable
Validity status: Planned
Road management: Other