A40 Eastbound Denham Roundabout to Swakeleys Roundabout Lane 1 Closure

Cleared

Start time: Mon, Sep 28, 2026 9:00 PM
Expected end: Tue, Sep 29, 2026 4:30 AM
Duration: 5 hours 15 minutes 2 seconds
Road: A40 – A40 Eastbound Between M40 And B467
Category: Road Maintenance
Direction: Eastbound
Carriageway: Dual Carriageway
Lanes affected: 1 of 2 lanes affected, 1 of 3 lanes affected
Reason: Repair Work

Live incident

Active roadworks

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Cleared

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First published: Mon, Sep 28, 2026 9:25 PM
Last updated: Tue, Sep 29, 2026 1:59 AM
Cleared: Tue, Sep 29, 2026 2:15 AM

Latest update: A40 Eastbound Denham Roundabout to Swakeleys Roundabout Lane 1 Closure

Coordinates: 51.560237, -0.483189
Latitude span: 51.559507 – 51.560879
Longitude span: -0.490448 – -0.474847
Bounding box centre: 51.560193, -0.482648
Location descriptions: A40 eastbound between M40 and B467

M40 southbound within J1

Feed validity status: Active
Overall feed start: Mon, Sep 28, 2026 9:00 PM
Overall feed end: Tue, Sep 29, 2026 4:30 AM
Feed window length: 7 hours 30 minutes
Probability code (raw): certain
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: A40 eastbound between M40 and B467
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: 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 2

3 coordinate pairs

Description: M40 southbound within J1
Carriageway: Dual Carriageway
Lanes Restricted: 1 lane restricted
Operational Lanes: 3 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: 191 m
To Distance: 295 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.560879 -0.490448
51.56085 -0.490103
51.560754 -0.488952

Segment 3

5 coordinate pairs

Description: A40 eastbound between M40 and B467
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: 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 4

4 coordinate pairs

Description: A40 eastbound between M40 and B467
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: 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

Segment 5

2 coordinate pairs

Description: A40 eastbound between M40 and B467
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: 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

Geometry type: MultiLineString
Geometry points: 17
First coordinate pair: -0.477122, 51.559706
Road section segments: 1
Road section points: 17

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.477122,
                51.559706
            ],
            [
                -0.476942,
                51.55969
            ],
            [
                -0.474847,
                51.559507
            ],
            [
                -0.490448,
                51.560879
            ],
            [
                -0.490103,
                51.56085
            ],
            [
                -0.488952,
                51.560754
            ],
            [
                -0.483262,
                51.560238
            ],
            [
                -0.480339,
                51.559979
            ],
            [
                -0.480193,
                51.559966
            ],
            [
                -0.479488,
                51.559912
            ],
            [
                -0.477122,
                51.559706
            ],
            [
                -0.488952,
                51.560754
            ],
            [
                -0.48668,
                51.560545
            ],
            [
                -0.486248,
                51.560503
            ],
            [
                -0.485122,
                51.560403
            ],
            [
                -0.485122,
                51.560403
            ],
            [
                -0.483262,
                51.560238
            ]
        ]
    ]
}

View road section coordinates

Cause type: Road Maintenance
Detailed cause: Repair Work
Compliance: Mandatory
Probability: Certain
Validity status: Active
Road management: Other