M4 Jct 3 Roundabout lane 1 closure

Cleared

Start time: Sat, Mar 21, 2026 10:00 PM
Expected end: Sun, Mar 22, 2026 6:00 AM
Duration: 8 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

Hover or tap markers for full details

Move Insights

Thinking of moving to this area?

Check flood risk, planning history, EPC ratings and more with a Move Insights property report.

Flood risk assessment

Planning history

EPC ratings & more

Get a property report

First published: Sat, Mar 21, 2026 9:48 PM
Last updated: Sun, Mar 22, 2026 3:04 AM
Cleared: Sun, Mar 22, 2026 6:00 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: Sat, Mar 21, 2026 10:00 PM
Overall feed end: Sun, Mar 22, 2026 6:00 AM
Feed window length: 8 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