M4 Jct 3 Roundabout lane 1 closure

Cleared

Start time: Mon, Mar 23, 2026 10:30 PM
Expected end: Mon, Mar 23, 2026 5:30 AM
Duration: 17 hours
Road: A312 – Roundabout At M4 J3/A312
Category: Construction Work
Direction: Clockwise
Lanes affected: 1 of 2 lanes affected
Reason: Other

Live incident

Active roadworks

Planned

Cleared

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First published: Mon, Mar 23, 2026 1:09 AM
Last updated: Mon, Mar 23, 2026 4:56 AM
Cleared: Mon, Mar 23, 2026 5:30 AM

Latest update: M4 Jct 3 Roundabout lane 1 closure

Coordinates: 51.492804, -0.410077
Latitude span: 51.492663 – 51.492875
Longitude span: -0.410533 – -0.409653
Bounding box centre: 51.492769, -0.410093
Location descriptions: roundabout at M4 J3/A312

Feed validity status: Active
Overall feed start: Mon, Mar 23, 2026 10:30 PM
Overall feed end: Mon, Mar 23, 2026 5:30 AM
Feed window length: 17 hours
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

6 coordinate pairs

Description: roundabout at M4 J3/A312
Lanes Restricted: 1 lane restricted
Operational Lanes: 2 operational lanes
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: A312
Linear Element Model: The Network Model
Linear Element Id: {7D868D48-D2DA-43A7-9E31-6F2825DEA241}
Linear Element Type: Other
From Distance: 8 m
To Distance: 48 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.492862 -0.410533
51.492868 -0.410501
51.492875 -0.410385
51.492864 -0.410213
51.492854 -0.410141
51.492816 -0.40997

Segment 2

2 coordinate pairs

Description: roundabout at M4 J3/A312
Lanes Restricted: 1 lane restricted
Operational Lanes: 2 operational lanes
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: A312
Linear Element Model: The Network Model
Linear Element Id: {86F55386-D0F5-4C5A-BD47-D4698627D25B}
Linear Element Type: Other
From Distance: 0 m
To Distance: 21 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.492816 -0.40997
51.492713 -0.4097

Segment 3

2 coordinate pairs

Description: roundabout at M4 J3/A312
Lanes Restricted: 1 lane restricted
Operational Lanes: 2 operational lanes
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: A312
Linear Element Model: The Network Model
Linear Element Id: {970782A1-0E21-4816-BB64-064A1737A315}
Linear Element Type: Other
From Distance: 0 m
To Distance: 6 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.492713 -0.4097
51.492663 -0.409653

Geometry type: MultiLineString
Geometry points: 10
First coordinate pair: -0.410533, 51.492862
Road section segments: 1
Road section points: 10

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.410533,
                51.492862
            ],
            [
                -0.410501,
                51.492868
            ],
            [
                -0.410385,
                51.492875
            ],
            [
                -0.410213,
                51.492864
            ],
            [
                -0.410141,
                51.492854
            ],
            [
                -0.40997,
                51.492816
            ],
            [
                -0.40997,
                51.492816
            ],
            [
                -0.4097,
                51.492713
            ],
            [
                -0.4097,
                51.492713
            ],
            [
                -0.409653,
                51.492663
            ]
        ]
    ]
}

View road section coordinates

Cause type: Construction Work
Detailed cause: Other
Compliance: Mandatory
Probability: Certain
Validity status: Active
Road management: Other