M4 westbound Jct 12 Lane 1 closure on exit slip road

Active

Start time: Thu, Aug 6, 2026 6:55 PM
Expected end: Fri, Aug 7, 2026 4:00 AM
Duration: 9 hours 5 minutes
Road: M4 – M4 J12 Westbound Exit
Category: Authority Operation
Direction: Westbound
Lanes affected: Lane 1 closed, 1 of 3 lanes affected, 1 of 1 lanes affected
Reason: Other

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Active roadworks

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First published: Thu, Aug 6, 2026 6:55 PM
Last updated: Thu, Aug 6, 2026 10:21 PM
Cleared: Fri, Aug 7, 2026 4:00 AM

Latest update: M4 westbound Jct 12 Lane 1 closure on exit slip road

Coordinates: 51.437889, -1.064004
Latitude span: 51.437254 – 51.438300
Longitude span: -1.065343 – -1.062091
Bounding box centre: 51.437777, -1.063717
Location descriptions: M4 J12 westbound exit

Feed validity status: Active
Overall feed start: Thu, Aug 6, 2026 6:55 PM
Overall feed end: Fri, Aug 7, 2026 4:00 AM
Feed window length: 9 hours 5 minutes
Probability code (raw): certain
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

5 coordinate pairs

Description: M4 J12 westbound exit
Lane Usage: Cl1
Lane Number: 1
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 3 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: {C4676A65-CA9E-4A52-9735-BC385A84AC32}
Linear Element Type: A Carriageway Exit Slip
From Distance: 0 m
To Distance: 85 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.43798 -1.064234
51.438044 -1.064413
51.43825 -1.065017
51.438298 -1.065302
51.4383 -1.065343

Segment 2

4 coordinate pairs

Description: M4 J12 westbound exit
Lane Usage: Cl1
Lane Number: 1
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 1 operational lane
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: {459F1E5A-D4C3-C531-812C-866BBA30F76B}
Linear Element Type: A Carriageway Exit Slip
From Distance: 157 m
To Distance: 326 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.437254 -1.062091
51.437316 -1.062287
51.437583 -1.063116
51.43798 -1.064234

Geometry type: MultiLineString
Geometry points: 9
First coordinate pair: -1.064234, 51.437980
Road section segments: 1
Road section points: 9

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -1.064234,
                51.43798
            ],
            [
                -1.064413,
                51.438044
            ],
            [
                -1.065017,
                51.43825
            ],
            [
                -1.065302,
                51.438298
            ],
            [
                -1.065343,
                51.4383
            ],
            [
                -1.062091,
                51.437254
            ],
            [
                -1.062287,
                51.437316
            ],
            [
                -1.063116,
                51.437583
            ],
            [
                -1.064234,
                51.43798
            ]
        ]
    ]
}

View road section coordinates

Cause type: Authority Operation
Detailed cause: Other
Compliance: Mandatory
Probability: Certain
Validity status: Active
Road management: Other