M4 westbound Jct 17 exit and entry slip roads lane closures

Planned

Start time: Thu, Aug 20, 2026 7:00 PM
Expected end: Fri, Aug 21, 2026 5:00 AM
Duration: 10 hours
Road: M4 – M4 J17 Westbound Exit
Category: Road Maintenance
Direction: Westbound
Carriageway: Dual Carriageway
Lanes affected: Lane 2 closed, 1 of 2 lanes affected, 1 of 3 lanes affected
Reason: Maintenance Work

Live incident

Active roadworks

Planned

Cleared

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First published: Thu, Aug 6, 2026 10:55 AM
Last updated: Thu, Aug 20, 2026 3:17 AM
Cleared: Fri, Aug 21, 2026 5:00 AM

Latest update: M4 westbound Jct 17 exit and entry slip roads lane closures

Coordinates: 51.514711, -2.117815
Latitude span: 51.514314 – 51.515043
Longitude span: -2.120641 – -2.112176
Bounding box centre: 51.514679, -2.116409
Location descriptions: M4 J17 westbound exit

M4 westbound between J16 and J17

Feed validity status: Planned
Overall feed start: Thu, Aug 20, 2026 7:00 PM
Overall feed end: Fri, Aug 21, 2026 5:00 AM
Feed window length: 10 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

17 coordinate pairs

Description: M4 J17 westbound exit
Lane Usage: Cl2
Lane Number: 2
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 2 operational lanes
Direction On Section: West Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {69BA64A8-4C35-4A4E-825E-5D71229AB74F}
Linear Element Type: A Carriageway Exit Slip
From Distance: 0 m
To Distance: 472 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.515043 -2.114009
51.514928 -2.116061
51.514888 -2.116675
51.514873 -2.116911
51.514841 -2.117344
51.514805 -2.117683
51.514789 -2.11783
51.514731 -2.118372
51.514645 -2.119044
51.514515 -2.120153
51.514502 -2.120237
51.514494 -2.120276
51.514486 -2.120316
51.514467 -2.120382
51.514428 -2.120468
51.514366 -2.12058
51.514314 -2.120641

Segment 2

3 coordinate pairs

Description: M4 westbound between J16 and J17
Carriageway: Dual Carriageway
Lane Usage: Cl2
Lane Number: 2
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 3 operational lanes
Direction On Section: West Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M4
Linear Element Model: The Network Model
Linear Element Id: {1A07014C-3FA5-435F-A6BF-2CE9F881307C}
Linear Element Type: A Carriageway
From Distance: 1,051 m
To Distance: 1,179 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.515023 -2.112176
51.515032 -2.113132
51.515043 -2.114009

Geometry type: MultiLineString
Geometry points: 20
First coordinate pair: -2.114009, 51.515043
Road section segments: 1
Road section points: 20

View geometry JSON

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    "type": "MultiLineString",
    "coordinates": [
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                -2.114009,
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                51.514888
            ],
            [
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            [
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            ],
            [
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            ],
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}

View road section coordinates

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