M4 eastbound Jct 12 exit slip lane 1 closure

Planned

Start time: Tue, Aug 25, 2026 7:00 PM
Expected end: Wed, Aug 26, 2026 5:00 AM
Duration: 10 hours
Road: M4 – M4 J12 Eastbound Exit
Category: Construction Work
Direction: Eastbound
Carriageway: Dual Carriageway
Lanes affected: Lane 1 closed, 1 of 1 lanes affected, 1 of 2 lanes affected, 1 of 3 lanes affected
Reason: Road Improvement Or Upgrading

Live incident

Active roadworks

Planned

Cleared

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First published: Thu, Aug 6, 2026 11:56 AM
Last updated: Tue, Aug 25, 2026 8:13 AM
Cleared: Wed, Aug 26, 2026 5:00 AM

Latest update: M4 eastbound Jct 12 exit slip lane 1 closure

Coordinates: 51.440916, -1.067806
Latitude span: 51.439830 – 51.443029
Longitude span: -1.070830 – -1.065717
Bounding box centre: 51.441430, -1.068274
Location descriptions: M4 J12 eastbound exit

M4 eastbound between J13 and J12

Feed validity status: Planned
Overall feed start: Tue, Aug 25, 2026 7:00 PM
Overall feed end: Wed, Aug 26, 2026 5:00 AM
Feed window length: 10 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

5 coordinate pairs

Description: M4 J12 eastbound 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: East Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {02527A8E-1623-4ACD-BDBA-DF722F3269BC}
Linear Element Type: B Carriageway Exit Slip
From Distance: 0 m
To Distance: 284 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.44187 -1.06956
51.44139 -1.068768
51.440733 -1.067694
51.440138 -1.066647
51.440107 -1.066598

Segment 2

6 coordinate pairs

Description: M4 J12 eastbound exit
Lane Usage: Cl1
Lane Number: 1
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane 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: {47DB4B5F-22E1-5715-1972-8CF183C03CAD}
Linear Element Type: B Carriageway Exit Slip
From Distance: 0 m
To Distance: 71 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.440107 -1.066598
51.439946 -1.066341
51.439908 -1.066204
51.439854 -1.066004
51.439845 -1.065932
51.43983 -1.065717

Segment 3

4 coordinate pairs

Description: M4 eastbound between J13 and J12
Carriageway: Dual Carriageway
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: East Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {2613A219-9BE8-4994-92B8-BEF3C826D63A}
Linear Element Type: B Carriageway
From Distance: 2,172 m
To Distance: 2,329 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.443029 -1.07083
51.442677 -1.070448
51.442432 -1.070182
51.44187 -1.06956

Geometry type: MultiLineString
Geometry points: 15
First coordinate pair: -1.069560, 51.441870
Road section segments: 1
Road section points: 15

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -1.06956,
                51.44187
            ],
            [
                -1.068768,
                51.44139
            ],
            [
                -1.067694,
                51.440733
            ],
            [
                -1.066647,
                51.440138
            ],
            [
                -1.066598,
                51.440107
            ],
            [
                -1.066598,
                51.440107
            ],
            [
                -1.066341,
                51.439946
            ],
            [
                -1.066204,
                51.439908
            ],
            [
                -1.066004,
                51.439854
            ],
            [
                -1.065932,
                51.439845
            ],
            [
                -1.065717,
                51.43983
            ],
            [
                -1.07083,
                51.443029
            ],
            [
                -1.070448,
                51.442677
            ],
            [
                -1.070182,
                51.442432
            ],
            [
                -1.06956,
                51.44187
            ]
        ]
    ]
}

View road section coordinates

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