M4 Eastbound Jct15 to Jct 4 Lane closure

Planned

Start time: Wed, Mar 18, 2026 10:00 PM
Expected end: Thu, Mar 19, 2026 5:30 AM
Duration: 7 hours 30 minutes
Road: M4 – M4 Eastbound Between J4B And J4
Category: Road Maintenance
Direction: Eastbound
Carriageway: Dual Carriageway
Lanes affected: 1 of 4 lanes affected, 1 of 3 lanes affected
Reason: Roadworks

Active

Planned

Cleared

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First published: Wed, Mar 18, 2026 4:37 AM
Last updated: Thu, Mar 19, 2026 3:23 AM
Cleared: Thu, Mar 19, 2026 5:30 AM

Latest update: M4 Eastbound Jct15 to Jct 4 Lane closure

Coordinates: 51.495418, -0.467331
Latitude span: 51.494544 – 51.495927
Longitude span: -0.478721 – -0.457578
Bounding box centre: 51.495236, -0.468150
Location descriptions: M4 eastbound between J4B and J4

M4 eastbound within J4

Feed validity status: Planned
Overall feed start: Wed, Mar 18, 2026 10:00 PM
Overall feed end: Thu, Mar 19, 2026 5:30 AM
Feed window length: 7 hours 30 minutes
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

2 coordinate pairs

Description: M4 eastbound between J4B and J4
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 4 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: {6C74E352-01F1-450C-B9F1-385A3B48DFE5}
Linear Element Type: B Carriageway
From Distance: 693 m
To Distance: 723 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.495352 -0.469378
51.495386 -0.468957

Segment 2

11 coordinate pairs

Description: M4 eastbound between J4B and J4
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 4 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: {6C74E352-01F1-450C-B9F1-385A3B48DFE5}
Linear Element Type: B Carriageway
From Distance: 38 m
To Distance: 692 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.494544 -0.478721
51.494574 -0.478019
51.494678 -0.476309
51.494685 -0.4762
51.494718 -0.475842
51.494926 -0.473726
51.495042 -0.472585
51.495069 -0.472335
51.495157 -0.471541
51.495308 -0.469916
51.49535 -0.469397

Segment 3

2 coordinate pairs

Description: M4 eastbound within J4
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 3 operational lanes
Direction On Section: East Bound
Direction Relative: Aligned
Height Grade: Start1 End2
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {4442FA0A-EC3E-41C4-90D6-3ED4A57FAA16}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 88 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.495927 -0.460294
51.49592 -0.459019

Segment 4

3 coordinate pairs

Description: M4 eastbound within J4
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 3 operational lanes
Direction On Section: East Bound
Direction Relative: Aligned
Height Grade: Start1 End2
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {4442FA0A-EC3E-41C4-90D6-3ED4A57FAA16}
Linear Element Type: B Carriageway
From Distance: 93 m
To Distance: 188 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.495919 -0.458943
51.495913 -0.457754
51.495912 -0.457578

Segment 5

10 coordinate pairs

Description: M4 eastbound between J4B and J4
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 4 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: {91ACBDF6-ECF4-4085-B4FB-797B8BAEA54C}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 604 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.495386 -0.468957
51.495465 -0.467967
51.495628 -0.465586
51.495698 -0.464619
51.49571 -0.464441
51.495829 -0.462742
51.495892 -0.461414
51.495894 -0.461379
51.495894 -0.461345
51.495927 -0.460294

Geometry type: MultiLineString
Geometry points: 28
First coordinate pair: -0.469378, 51.495352
Road section segments: 1
Road section points: 28

View geometry JSON

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    "type": "MultiLineString",
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            ],
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                51.494544
            ],
            [
                -0.478019,
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            ],
            [
                -0.476309,
                51.494678
            ],
            [
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            [
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            ],
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            [
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            ],
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            ],
            [
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            ],
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            ],
            [
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            ],
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            ],
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            ],
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            ],
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            ]
        ]
    ]
}

View road section coordinates

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