Crash View

M4 Eastbound and Westbound Jct 3 Roundabout, Entry and exit Slip Road Closure

Cleared

M4 Eastbound and Westbound Jct 3 Roundabout, Entry and exit Slip Road Closure

Start time
Sun, Feb 1, 2026 10:30 PM
Expected end
Mon, Feb 2, 2026 5:30 AM
Duration
7 hours
Road
A312 – Roundabout At M4 J3/A312
Category
Road Maintenance
Direction
Clockwise
Reason
Roadworks
Live incident
Active roadworks
Planned
Cleared
Hover or tap markers for full details

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First published
Thu, Jan 15, 2026 12:02 PM
Last updated
Sun, Feb 1, 2026 1:31 AM
Cleared
Mon, Feb 2, 2026 5:30 AM
  • Latest update: M4 Eastbound and Westbound Jct 3 Roundabout, Entry and exit Slip Road Closure
Coordinates
51.492280, -0.411151
Latitude span
51.491146 – 51.492884
Longitude span
-0.416739 – -0.410027
Bounding box centre
51.492015, -0.413383
Location descriptions
  • roundabout at M4 J3/A312
  • M4 J3 eastbound exit
Feed validity status
Suspended
Overall feed start
Sun, Feb 1, 2026 10:30 PM
Overall feed end
Mon, Feb 2, 2026 5:30 AM
Feed window length
7 hours
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
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{7636FA29-3AFD-49FC-90D5-F0755057E42D}
Linear Element Type
Other
From Distance
0 m
To Distance
16 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.492765 -0.41085
51.492791 -0.410806
51.492826 -0.410718
51.492843 -0.410646

Segment 2

3 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{0ACAF605-812B-4C55-BCB4-64E4C3CB7F38}
Linear Element Type
Other
From Distance
0 m
To Distance
59 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.491778 -0.411
51.492144 -0.411144
51.4923 -0.411164

Segment 3

6 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
0 m
To Distance
44 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.492843 -0.410646
51.492868 -0.410501
51.492875 -0.410385
51.492864 -0.410213
51.492854 -0.410141
51.492829 -0.410027

Segment 4

3 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{F08BDEF6-9746-4263-BA74-FBE25DD0D01A}
Linear Element Type
Other
From Distance
0 m
To Distance
10 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.491316 -0.4108
51.49138 -0.410841
51.491407 -0.410854

Segment 5

2 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{81F30273-69D1-424F-B811-77F0281BCF2A}
Linear Element Type
Other
From Distance
0 m
To Distance
15 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.491642 -0.410947
51.491778 -0.411

Segment 6

5 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{6C585F0B-FBA4-41BD-BE33-FD89167CA0CA}
Linear Element Type
Other
From Distance
14 m
To Distance
46 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.491146 -0.410449
51.49115 -0.410474
51.491188 -0.410602
51.491252 -0.41073
51.491316 -0.4108

Segment 7

6 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{17C78139-6729-4676-8B71-151B9AF7DCB4}
Linear Element Type
Other
From Distance
0 m
To Distance
40 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.492464 -0.411133
51.492548 -0.411107
51.492606 -0.411086
51.492686 -0.410997
51.492739 -0.410909
51.492765 -0.41085

Segment 8

2 coordinate pairs
Description
M4 J3 eastbound exit
Lanes Restricted
2 lanes restricted
Operational Lanes
0 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
{0C54E77D-94D2-46E8-B6B4-4FDC0F933CC4}
Linear Element Type
B Carriageway Exit Slip
From Distance
0 m
To Distance
58 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.492784 -0.411784
51.492767 -0.410949

Segment 9

2 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{3B5A2CE2-AA53-4EB8-9B3A-B9F556A74EB6}
Linear Element Type
Other
From Distance
0 m
To Distance
26 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.491407 -0.410854
51.491642 -0.410947

Segment 10

4 coordinate pairs
Description
roundabout at M4 J3/A312
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
{67BA765D-018F-438D-BCB8-C42D2D726972}
Linear Element Type
Other
From Distance
0 m
To Distance
18 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.4923 -0.411164
51.492419 -0.411137
51.492427 -0.411136
51.492464 -0.411133

Segment 11

4 coordinate pairs
Description
M4 J3 eastbound exit
Lanes Restricted
2 lanes restricted
Operational Lanes
0 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
{3E139173-1EED-47DE-9DBB-1CDB4B738CA6}
Linear Element Type
B Carriageway Exit Slip
From Distance
0 m
To Distance
344 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.492862 -0.416739
51.492884 -0.415657
51.49279 -0.412074
51.492784 -0.411784
Geometry type
MultiLineString
Geometry points
41
First coordinate pair
-0.410850, 51.492765
Road section segments
1
Road section points
41
View geometry JSON 
{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.41085,
                51.492765
            ],
            [
                -0.410806,
                51.492791
            ],
            [
                -0.410718,
                51.492826
            ],
            [
                -0.410646,
                51.492843
            ],
            [
                -0.411,
                51.491778
            ],
            [
                -0.411144,
                51.492144
            ],
            [
                -0.411164,
                51.4923
            ],
            [
                -0.410646,
                51.492843
            ],
            [
                -0.410501,
                51.492868
            ],
            [
                -0.410385,
                51.492875
            ],
            [
                -0.410213,
                51.492864
            ],
            [
                -0.410141,
                51.492854
            ],
            [
                -0.410027,
                51.492829
            ],
            [
                -0.4108,
                51.491316
            ],
            [
                -0.410841,
                51.49138
            ],
            [
                -0.410854,
                51.491407
            ],
            [
                -0.410947,
                51.491642
            ],
            [
                -0.411,
                51.491778
            ],
            [
                -0.410449,
                51.491146
            ],
            [
                -0.410474,
                51.49115
            ],
            [
                -0.410602,
                51.491188
            ],
            [
                -0.41073,
                51.491252
            ],
            [
                -0.4108,
                51.491316
            ],
            [
                -0.411133,
                51.492464
            ],
            [
                -0.411107,
                51.492548
            ],
            [
                -0.411086,
                51.492606
            ],
            [
                -0.410997,
                51.492686
            ],
            [
                -0.410909,
                51.492739
            ],
            [
                -0.41085,
                51.492765
            ],
            [
                -0.411784,
                51.492784
            ],
            [
                -0.410949,
                51.492767
            ],
            [
                -0.410854,
                51.491407
            ],
            [
                -0.410947,
                51.491642
            ],
            [
                -0.411164,
                51.4923
            ],
            [
                -0.411137,
                51.492419
            ],
            [
                -0.411136,
                51.492427
            ],
            [
                -0.411133,
                51.492464
            ],
            [
                -0.416739,
                51.492862
            ],
            [
                -0.415657,
                51.492884
            ],
            [
                -0.412074,
                51.49279
            ],
            [
                -0.411784,
                51.492784
            ]
        ]
    ]
}
View road section coordinates 
[
    [
        [
            -0.41085,
            51.492765
        ],
        [
            -0.410806,
            51.492791
        ],
        [
            -0.410718,
            51.492826
        ],
        [
            -0.410646,
            51.492843
        ],
        [
            -0.411,
            51.491778
        ],
        [
            -0.411144,
            51.492144
        ],
        [
            -0.411164,
            51.4923
        ],
        [
            -0.410646,
            51.492843
        ],
        [
            -0.410501,
            51.492868
        ],
        [
            -0.410385,
            51.492875
        ],
        [
            -0.410213,
            51.492864
        ],
        [
            -0.410141,
            51.492854
        ],
        [
            -0.410027,
            51.492829
        ],
        [
            -0.4108,
            51.491316
        ],
        [
            -0.410841,
            51.49138
        ],
        [
            -0.410854,
            51.491407
        ],
        [
            -0.410947,
            51.491642
        ],
        [
            -0.411,
            51.491778
        ],
        [
            -0.410449,
            51.491146
        ],
        [
            -0.410474,
            51.49115
        ],
        [
            -0.410602,
            51.491188
        ],
        [
            -0.41073,
            51.491252
        ],
        [
            -0.4108,
            51.491316
        ],
        [
            -0.411133,
            51.492464
        ],
        [
            -0.411107,
            51.492548
        ],
        [
            -0.411086,
            51.492606
        ],
        [
            -0.410997,
            51.492686
        ],
        [
            -0.410909,
            51.492739
        ],
        [
            -0.41085,
            51.492765
        ],
        [
            -0.411784,
            51.492784
        ],
        [
            -0.410949,
            51.492767
        ],
        [
            -0.410854,
            51.491407
        ],
        [
            -0.410947,
            51.491642
        ],
        [
            -0.411164,
            51.4923
        ],
        [
            -0.411137,
            51.492419
        ],
        [
            -0.411136,
            51.492427
        ],
        [
            -0.411133,
            51.492464
        ],
        [
            -0.416739,
            51.492862
        ],
        [
            -0.415657,
            51.492884
        ],
        [
            -0.412074,
            51.49279
        ],
        [
            -0.411784,
            51.492784
        ]
    ]
]
Cause type
Road Maintenance
Detailed cause
Roadworks
Compliance
Mandatory
Probability
Certain
Validity status
Suspended
Road management
Carriageway Closures
Feed provider
National Highways
Data source
Roadworks
Feed version
1
Record created
Thu, Jan 15, 2026 12:02 PM
Record versioned
Sun, Feb 1, 2026 1:31 AM
Coordinate source
Geometry

Driving on the A312? See every live closure, roadwork and planned restriction on this road.

A312 live closures

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