M4 westbound Membury Services closure

Cleared

Start time: Fri, Sep 25, 2026 8:45 PM
Expected end: Sat, Sep 26, 2026 5:00 AM
Duration: 3 hours 45 minutes 2 seconds
Road: M4 – M4 Westbound Between J14 And J15
Category: Road Maintenance
Direction: Westbound
Carriageway: Dual Carriageway
Reason: Maintenance Work

Live incident

Active roadworks

Planned

Cleared

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First published: Fri, Sep 25, 2026 8:45 PM
Last updated: Sat, Sep 26, 2026 12:12 AM
Cleared: Sat, Sep 26, 2026 12:30 AM

Latest update: M4 westbound Membury Services closure

Coordinates: 51.481741, -1.557018
Latitude span: 51.478869 – 51.485075
Longitude span: -1.565544 – -1.550406
Bounding box centre: 51.481972, -1.557975
Location descriptions: M4 westbound between J14 and J15

M4 westbound at the Membury services slip road between J14 and J15

Feed validity status: Active
Overall feed start: Fri, Sep 25, 2026 8:45 PM
Overall feed end: Sat, Sep 26, 2026 5:00 AM
Feed window length: 8 hours 15 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

4 coordinate pairs

Description: M4 westbound between J14 and J15
Carriageway: Dual Carriageway
Lanes Restricted: 4 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: West Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {9E0660BF-BFD3-4635-A85B-A98AB37B0BAA}
Linear Element Type: A Carriageway
From Distance: 0 m
To Distance: 161 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.484468 -1.563431
51.484638 -1.563983
51.484787 -1.564498
51.485075 -1.565544

Segment 2

2 coordinate pairs

Description: M4 westbound between J14 and J15
Carriageway: Dual Carriageway
Lanes Restricted: 4 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: West Bound
Direction Relative: Aligned
Height Grade: Start2 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {10587E38-7075-4D35-8B47-A0ACDC761D50}
Linear Element Type: A Carriageway
From Distance: 1,656 m
To Distance: 1,731 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.478869 -1.550406
51.479287 -1.551248

Segment 3

3 coordinate pairs

Description: M4 westbound at the Membury services slip road between J14 and J15
Lanes Restricted: 2 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: West Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {4036C71A-BAEA-4258-B3CE-2B9C702D43DC}
Linear Element Type: A Carriageway Entry Slip
From Distance: 47 m
To Distance: 257 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.483483 -1.560839
51.483572 -1.561036
51.484468 -1.563431

Segment 4

5 coordinate pairs

Description: M4 westbound at the Membury services slip road between J14 and J15
Lanes Restricted: 2 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: West Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {79F7C268-AF44-4F2C-B9B5-CC975894809B}
Linear Element Type: A Carriageway Exit Slip
From Distance: 0 m
To Distance: 181 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.47949 -1.551602
51.480074 -1.55297
51.480159 -1.553196
51.480292 -1.553503
51.480413 -1.553753

Segment 5

2 coordinate pairs

Description: M4 westbound between J14 and J15
Carriageway: Dual Carriageway
Lanes Restricted: 4 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: West Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {1224D880-AF10-47C3-9186-85438DD08378}
Linear Element Type: A Carriageway
From Distance: 0 m
To Distance: 33 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.479287 -1.551248
51.47949 -1.551602

Geometry type: MultiLineString
Geometry points: 16
First coordinate pair: -1.563431, 51.484468
Road section segments: 1
Road section points: 16

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -1.563431,
                51.484468
            ],
            [
                -1.563983,
                51.484638
            ],
            [
                -1.564498,
                51.484787
            ],
            [
                -1.565544,
                51.485075
            ],
            [
                -1.550406,
                51.478869
            ],
            [
                -1.551248,
                51.479287
            ],
            [
                -1.560839,
                51.483483
            ],
            [
                -1.561036,
                51.483572
            ],
            [
                -1.563431,
                51.484468
            ],
            [
                -1.551602,
                51.47949
            ],
            [
                -1.55297,
                51.480074
            ],
            [
                -1.553196,
                51.480159
            ],
            [
                -1.553503,
                51.480292
            ],
            [
                -1.553753,
                51.480413
            ],
            [
                -1.551248,
                51.479287
            ],
            [
                -1.551602,
                51.47949
            ]
        ]
    ]
}

View road section coordinates

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