Crash View

M4 eastbound Jct 21 to Jct 20 lane closure 184/8-186/4

Planned

M4 eastbound Jct 21 to Jct 20 lane closure 184/8-186/4

Start time
Fri, Aug 14, 2026 8:00 PM
Expected end
Sat, Aug 15, 2026 5:00 AM
Duration
9 hours
Road
M5 – Link Road From M4 J20 Eastbound To M5 J15 Northbound
Category
Road Maintenance
Direction
Northbound
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
Fri, Jul 31, 2026 12:44 PM
Last updated
Fri, Aug 14, 2026 1:36 AM
Cleared
Sat, Aug 15, 2026 5:00 AM
  • Latest update: M4 eastbound Jct 21 to Jct 20 lane closure 184/8-186/4
Coordinates
51.559105, -2.559705
Latitude span
51.553548 – 51.567141
Longitude span
-2.572410 – -2.553043
Bounding box centre
51.560345, -2.562727
Location descriptions
  • link road from M4 J20 eastbound to M5 J15 northbound
  • link road from M5 J15 to M5 J20 westbound
  • M4 eastbound within J20
  • M4 eastbound between J21 and J20
Feed validity status
Planned
Overall feed start
Fri, Aug 14, 2026 8:00 PM
Overall feed end
Sat, Aug 15, 2026 5:00 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
link road from M4 J20 eastbound to M5 J15 northbound
Lanes Restricted
2 lanes restricted
Operational Lanes
1 operational lane
Direction On Section
North Bound
Direction Relative
Aligned
Height Grade
Start1 End1
Linear Element Road
M5
Linear Element Model
The Network Model
Linear Element Id
{0B7B371B-00B1-4C02-ACC7-CE21C8F7A7C6}
Linear Element Type
B Carriageway Entry Slip
From Distance
0 m
To Distance
54 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.553882 -2.553621
51.553548 -2.553043

Segment 2

12 coordinate pairs
Description
link road from M5 J15 to M5 J20 westbound
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
{ABB6A540-40C4-4072-BF82-7D58F2B5555B}
Linear Element Type
B Carriageway Exit Slip
From Distance
98 m
To Distance
462 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.556672 -2.556297
51.556668 -2.556294
51.556579 -2.556214
51.555494 -2.555356
51.554866 -2.554858
51.554539 -2.554532
51.554531 -2.554524
51.554464 -2.55444
51.554205 -2.554112
51.554116 -2.553995
51.554071 -2.553923
51.553882 -2.553621

Segment 3

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 4

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 5

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 6

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
282 m
To Distance
388 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.567141 -2.57241
51.566585 -2.571359
51.566526 -2.57125
Geometry type
MultiLineString
Geometry points
39
First coordinate pair
-2.553621, 51.553882
Road section segments
1
Road section points
39
View geometry JSON 
{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -2.553621,
                51.553882
            ],
            [
                -2.553043,
                51.553548
            ],
            [
                -2.556297,
                51.556672
            ],
            [
                -2.556294,
                51.556668
            ],
            [
                -2.556214,
                51.556579
            ],
            [
                -2.555356,
                51.555494
            ],
            [
                -2.554858,
                51.554866
            ],
            [
                -2.554532,
                51.554539
            ],
            [
                -2.554524,
                51.554531
            ],
            [
                -2.55444,
                51.554464
            ],
            [
                -2.554112,
                51.554205
            ],
            [
                -2.553995,
                51.554116
            ],
            [
                -2.553923,
                51.554071
            ],
            [
                -2.553621,
                51.553882
            ],
            [
                -2.556984,
                51.557446
            ],
            [
                -2.556376,
                51.556648
            ],
            [
                -2.57125,
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            [
                -2.56905,
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            [
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            ],
            [
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            ],
            [
                -2.564011,
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            ],
            [
                -2.56385,
                51.562645
            ],
            [
                -2.563576,
                51.562522
            ],
            [
                -2.561701,
                51.561416
            ],
            [
                -2.561178,
                51.561086
            ],
            [
                -2.560872,
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            ],
            [
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            ],
            [
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            ],
            [
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                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
            ],
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                -2.57241,
                51.567141
            ],
            [
                -2.571359,
                51.566585
            ],
            [
                -2.57125,
                51.566526
            ]
        ]
    ]
}
View road section coordinates 
[
    [
        [
            -2.553621,
            51.553882
        ],
        [
            -2.553043,
            51.553548
        ],
        [
            -2.556297,
            51.556672
        ],
        [
            -2.556294,
            51.556668
        ],
        [
            -2.556214,
            51.556579
        ],
        [
            -2.555356,
            51.555494
        ],
        [
            -2.554858,
            51.554866
        ],
        [
            -2.554532,
            51.554539
        ],
        [
            -2.554524,
            51.554531
        ],
        [
            -2.55444,
            51.554464
        ],
        [
            -2.554112,
            51.554205
        ],
        [
            -2.553995,
            51.554116
        ],
        [
            -2.553923,
            51.554071
        ],
        [
            -2.553621,
            51.553882
        ],
        [
            -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
        ],
        [
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            51.567141
        ],
        [
            -2.571359,
            51.566585
        ],
        [
            -2.57125,
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        ]
    ]
]
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
Fri, Jul 31, 2026 12:44 PM
Record versioned
Fri, Aug 14, 2026 1:36 AM
Coordinate source
Geometry

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