Crash View

M4 Eastbound Jct 20 lane 1,2 closure with splitter for jct 20 189/0b - 186/9b

Planned

M4 Eastbound Jct 20 lane 1,2 closure with splitter for jct 20 189/0b - 186/9b

Start time
Wed, Oct 28, 2026 9:00 PM
Expected end
Thu, Oct 29, 2026 6:00 AM
Duration
9 hours
Road
M4 – M4 Eastbound Within J20
Category
Road Maintenance
Direction
Eastbound
Carriageway
Dual Carriageway
Lanes affected
2 of 1 lanes affected, 2 of 2 lanes affected
Reason
Maintenance Work
Live incident
Active roadworks
Planned
Cleared
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First published
Wed, Sep 30, 2026 11:15 AM
Last updated
Wed, Oct 28, 2026 1:02 AM
Cleared
Thu, Oct 29, 2026 6:00 AM
  • Latest update: M4 Eastbound Jct 20 lane 1,2 closure with splitter for jct 20 189/0b - 186/9b
Coordinates
51.560107, -2.561004
Latitude span
51.552864 – 51.567122
Longitude span
-2.572375 – -2.553464
Bounding box centre
51.559993, -2.562920
Location descriptions
  • M4 eastbound within J20
  • M4 eastbound between J21 and J20
Feed validity status
Planned
Overall feed start
Wed, Oct 28, 2026 9:00 PM
Overall feed end
Thu, Oct 29, 2026 6:00 AM
Feed window length
9 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

2 coordinate pairs
Description
M4 eastbound within J20
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes 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
{28ED533E-2B58-4717-A7A3-2B792A8EAEAA}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
98 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.557446 -2.556984
51.556648 -2.556376

Segment 2

14 coordinate pairs
Description
M4 eastbound between J21 and J20
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start2 End1
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{851BB8E6-6940-4369-BCF5-A96FE8932F11}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
1,098 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.566526 -2.57125
51.565391 -2.56905
51.563476 -2.565391
51.563039 -2.564578
51.562736 -2.564011
51.562645 -2.56385
51.562522 -2.563576
51.561416 -2.561701
51.561086 -2.561178
51.560881 -2.560872
51.560732 -2.560668
51.56038 -2.560188
51.560139 -2.559868
51.559898 -2.559545

Segment 3

6 coordinate pairs
Description
M4 eastbound between J21 and J20
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes 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
{BBCF13CD-84AD-4542-B91E-D5E3F80455EE}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
325 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.559898 -2.559545
51.559388 -2.55895
51.558879 -2.558366
51.558404 -2.55787
51.558351 -2.557826
51.557446 -2.556984

Segment 4

3 coordinate pairs
Description
M4 eastbound between J21 and J20
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start2 End2
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{95389D73-FE00-466C-8212-0202FD4420EA}
Linear Element Type
B Carriageway
From Distance
286 m
To Distance
388 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.567122 -2.572375
51.566585 -2.571359
51.566526 -2.57125

Segment 5

6 coordinate pairs
Description
M4 eastbound within J20
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes 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
{28ED533E-2B58-4717-A7A3-2B792A8EAEAA}
Linear Element Type
B Carriageway
From Distance
98 m
To Distance
565 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.556642 -2.556372
51.554553 -2.55478
51.554311 -2.554618
51.553809 -2.554237
51.553576 -2.554032
51.552864 -2.553464
Geometry type
MultiLineString
Geometry points
31
First coordinate pair
-2.556984, 51.557446
Road section segments
1
Road section points
31
View geometry JSON 
{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -2.556984,
                51.557446
            ],
            [
                -2.556376,
                51.556648
            ],
            [
                -2.57125,
                51.566526
            ],
            [
                -2.56905,
                51.565391
            ],
            [
                -2.565391,
                51.563476
            ],
            [
                -2.564578,
                51.563039
            ],
            [
                -2.564011,
                51.562736
            ],
            [
                -2.56385,
                51.562645
            ],
            [
                -2.563576,
                51.562522
            ],
            [
                -2.561701,
                51.561416
            ],
            [
                -2.561178,
                51.561086
            ],
            [
                -2.560872,
                51.560881
            ],
            [
                -2.560668,
                51.560732
            ],
            [
                -2.560188,
                51.56038
            ],
            [
                -2.559868,
                51.560139
            ],
            [
                -2.559545,
                51.559898
            ],
            [
                -2.559545,
                51.559898
            ],
            [
                -2.55895,
                51.559388
            ],
            [
                -2.558366,
                51.558879
            ],
            [
                -2.55787,
                51.558404
            ],
            [
                -2.557826,
                51.558351
            ],
            [
                -2.556984,
                51.557446
            ],
            [
                -2.572375,
                51.567122
            ],
            [
                -2.571359,
                51.566585
            ],
            [
                -2.57125,
                51.566526
            ],
            [
                -2.556372,
                51.556642
            ],
            [
                -2.55478,
                51.554553
            ],
            [
                -2.554618,
                51.554311
            ],
            [
                -2.554237,
                51.553809
            ],
            [
                -2.554032,
                51.553576
            ],
            [
                -2.553464,
                51.552864
            ]
        ]
    ]
}
View road section coordinates 
[
    [
        [
            -2.556984,
            51.557446
        ],
        [
            -2.556376,
            51.556648
        ],
        [
            -2.57125,
            51.566526
        ],
        [
            -2.56905,
            51.565391
        ],
        [
            -2.565391,
            51.563476
        ],
        [
            -2.564578,
            51.563039
        ],
        [
            -2.564011,
            51.562736
        ],
        [
            -2.56385,
            51.562645
        ],
        [
            -2.563576,
            51.562522
        ],
        [
            -2.561701,
            51.561416
        ],
        [
            -2.561178,
            51.561086
        ],
        [
            -2.560872,
            51.560881
        ],
        [
            -2.560668,
            51.560732
        ],
        [
            -2.560188,
            51.56038
        ],
        [
            -2.559868,
            51.560139
        ],
        [
            -2.559545,
            51.559898
        ],
        [
            -2.559545,
            51.559898
        ],
        [
            -2.55895,
            51.559388
        ],
        [
            -2.558366,
            51.558879
        ],
        [
            -2.55787,
            51.558404
        ],
        [
            -2.557826,
            51.558351
        ],
        [
            -2.556984,
            51.557446
        ],
        [
            -2.572375,
            51.567122
        ],
        [
            -2.571359,
            51.566585
        ],
        [
            -2.57125,
            51.566526
        ],
        [
            -2.556372,
            51.556642
        ],
        [
            -2.55478,
            51.554553
        ],
        [
            -2.554618,
            51.554311
        ],
        [
            -2.554237,
            51.553809
        ],
        [
            -2.554032,
            51.553576
        ],
        [
            -2.553464,
            51.552864
        ]
    ]
]
Cause type
Road Maintenance
Detailed cause
Maintenance Work
Compliance
Mandatory
Probability
Probable
Validity status
Planned
Road management
Other
Feed provider
National Highways
Data source
Roadworks
Feed version
1
Record created
Wed, Sep 30, 2026 11:15 AM
Record versioned
Wed, Oct 28, 2026 1:02 AM
Coordinate source
Geometry

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