M4 Eastbound Jct 5 to Jct 4B Lane 1 closure

Planned

Start time: Wed, Aug 19, 2026 9:00 PM
Expected end: Thu, Aug 20, 2026 4:30 AM
Duration: 7 hours 30 minutes
Road: M4 – M4 Eastbound Between J5 And J4B
Category: Road Maintenance
Direction: Eastbound
Carriageway: Dual Carriageway
Lanes affected: 1 of 2 lanes affected, 1 of 3 lanes affected, 1 of 4 lanes affected
Reason: Roadworks

Live incident

Active roadworks

Planned

Cleared

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First published: Tue, Aug 18, 2026 8:53 PM
Last updated: Wed, Aug 19, 2026 1:37 AM
Cleared: Thu, Aug 20, 2026 4:30 AM

Latest update: M4 Eastbound Jct 5 to Jct 4B Lane 1 closure

Coordinates: 51.493651, -0.516079
Latitude span: 51.493119 – 51.494829
Longitude span: -0.532990 – -0.499266
Bounding box centre: 51.493974, -0.516128
Location descriptions: M4 eastbound between J5 and J4B

M4 eastbound within J4B

Feed validity status: Planned
Overall feed start: Wed, Aug 19, 2026 9:00 PM
Overall feed end: Thu, Aug 20, 2026 4:30 AM
Feed window length: 7 hours 30 minutes
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

3 coordinate pairs

Description: M4 eastbound between J5 and J4B
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane 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: {2D7FBEAA-7E69-47DC-8335-F678E9006D5D}
Linear Element Type: B Carriageway
From Distance: 20 m
To Distance: 37 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.493196 -0.53299
51.493198 -0.532962
51.493212 -0.532747

Segment 2

2 coordinate pairs

Description: M4 eastbound within J4B
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 3 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: {1E8346D9-F0A3-4B38-AB37-2A66464831C2}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 79 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.494215 -0.505777
51.494353 -0.504652

Segment 3

30 coordinate pairs

Description: M4 eastbound between J5 and J4B
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 4 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: {E240EF51-44E3-47A6-AAA7-217FB89D1F13}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 1,870 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.493212 -0.532747
51.493249 -0.532127
51.493264 -0.531853
51.493277 -0.531492
51.493297 -0.530915
51.493315 -0.530194
51.493328 -0.529476
51.493336 -0.529027
51.493332 -0.527947
51.493309 -0.526881
51.493293 -0.526277
51.493276 -0.524923
51.493173 -0.520389
51.493122 -0.517726
51.49312 -0.516717
51.493119 -0.51604
51.49312 -0.515421
51.493171 -0.514123
51.493174 -0.514036
51.493233 -0.513026
51.493328 -0.511957
51.493343 -0.511783
51.493456 -0.510757
51.493557 -0.510037
51.493572 -0.509932
51.493679 -0.509208
51.493713 -0.509008
51.493972 -0.507441
51.494091 -0.506602
51.494178 -0.505994

Segment 4

2 coordinate pairs

Description: M4 eastbound between J5 and J4B
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 4 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: {8266070A-9116-4A3E-B544-1AAE10E774C0}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 15 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.494178 -0.505994
51.494215 -0.505777

Segment 5

7 coordinate pairs

Description: M4 eastbound within J4B
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 3 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: {1E8346D9-F0A3-4B38-AB37-2A66464831C2}
Linear Element Type: B Carriageway
From Distance: 80 m
To Distance: 457 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.494355 -0.504638
51.494535 -0.503162
51.494538 -0.503137
51.494646 -0.50201
51.494739 -0.500825
51.494821 -0.499465
51.494829 -0.499266

Geometry type: MultiLineString
Geometry points: 44
First coordinate pair: -0.532990, 51.493196
Road section segments: 1
Road section points: 44

View geometry JSON

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        ]
    ]
}

View road section coordinates

Cause type: Road Maintenance
Detailed cause: Roadworks
Compliance: Mandatory
Probability: Probable
Validity status: Planned
Road management: Other