A40 Eastbound Jct Denham Roundabout to Jct Swakeleys lane closure

Planned

Start time: Mon, Jan 5, 2026 10:00 PM
Expected end: Tue, Jan 6, 2026 5:00 AM
Duration: 7 hours
Road: A40 – A40 Eastbound Between M40 And B467
Category: Road Maintenance
Direction: Eastbound
Carriageway: Dual Carriageway
Lanes affected: 2 of 1 lanes affected, 2 of 2 lanes affected
Reason: Maintenance Work

Active

Planned

Cleared

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First published: Tue, Dec 23, 2025 9:36 AM
Last updated: Mon, Jan 5, 2026 11:06 PM
Cleared: Tue, Jan 6, 2026 5:00 AM

Latest update: A40 Eastbound Jct Denham Roundabout to Jct Swakeleys lane closure

Coordinates: 51.560439, -0.485484
Latitude span: 51.559507 – 51.561484
Longitude span: -0.497310 – -0.474847
Bounding box centre: 51.560496, -0.486079
Location descriptions: A40 eastbound between M40 and B467

M40 southbound within J1

Feed validity status: Planned
Overall feed start: Mon, Jan 5, 2026 10:00 PM
Overall feed end: Tue, Jan 6, 2026 5:00 AM
Feed window length: 7 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: A40 eastbound between M40 and B467
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: A40
Linear Element Model: The Network Model
Linear Element Id: {6F19826B-6229-4312-BDB3-60C2B4ACF6B9}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 130 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.560403 -0.485122
51.560238 -0.483262

Segment 2

4 coordinate pairs

Description: M40 southbound within J1
Carriageway: Dual Carriageway
Lanes Restricted: 2 lanes restricted
Operational Lanes: 2 operational lanes
Direction On Section: South Bound
Direction Relative: Aligned
Height Grade: Start2 End2
Linear Element Road: M40
Linear Element Model: The Network Model
Linear Element Id: {7FE21EAB-0610-4A31-B569-040998C3BF6E}
Linear Element Type: B Carriageway
From Distance: 65 m
To Distance: 354 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.561484 -0.49731
51.561177 -0.493872
51.561177 -0.493858
51.561114 -0.493182

Segment 3

3 coordinate pairs

Description: M40 southbound within J1
Carriageway: Dual Carriageway
Lanes Restricted: 2 lanes restricted
Operational Lanes: 2 operational lanes
Direction On Section: South Bound
Direction Relative: Aligned
Height Grade: Start2 End1
Linear Element Road: M40
Linear Element Model: The Network Model
Linear Element Id: {BF582C7F-CA75-4144-8A77-187F9CD1FF15}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 295 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.561114 -0.493182
51.56085 -0.490103
51.560754 -0.488952

Segment 4

3 coordinate pairs

Description: A40 eastbound between M40 and B467
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: A40
Linear Element Model: The Network Model
Linear Element Id: {177E2170-0EFE-4AAB-9E21-EAFEC64C25EE}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 159 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.559706 -0.477122
51.55969 -0.476942
51.559507 -0.474847

Segment 5

5 coordinate pairs

Description: A40 eastbound between M40 and B467
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: A40
Linear Element Model: The Network Model
Linear Element Id: {9C535FA2-4878-49C1-AB8D-C57FE3A02E29}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 429 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.560238 -0.483262
51.559979 -0.480339
51.559966 -0.480193
51.559912 -0.479488
51.559706 -0.477122

Segment 6

4 coordinate pairs

Description: A40 eastbound between M40 and B467
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: A40
Linear Element Model: The Network Model
Linear Element Id: {B22E61BC-D1AD-432A-886B-E69E47690DF4}
Linear Element Type: B Carriageway
From Distance: 0 m
To Distance: 268 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.560754 -0.488952
51.560545 -0.48668
51.560503 -0.486248
51.560403 -0.485122

Geometry type: MultiLineString
Geometry points: 21
First coordinate pair: -0.485122, 51.560403
Road section segments: 1
Road section points: 21

View geometry JSON

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    "type": "MultiLineString",
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                -0.485122,
                51.560403
            ],
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            ],
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                51.561484
            ],
            [
                -0.493872,
                51.561177
            ],
            [
                -0.493858,
                51.561177
            ],
            [
                -0.493182,
                51.561114
            ],
            [
                -0.493182,
                51.561114
            ],
            [
                -0.490103,
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            ],
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            ],
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            ],
            [
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            ],
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            ],
            [
                -0.483262,
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            ],
            [
                -0.480339,
                51.559979
            ],
            [
                -0.480193,
                51.559966
            ],
            [
                -0.479488,
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            ],
            [
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                51.559706
            ],
            [
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            ],
            [
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            ],
            [
                -0.486248,
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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