A40 Jct Denham roundabout lane closure

Planned

Start time: Tue, Dec 2, 2025 10:00 PM
Expected end: Wed, Dec 3, 2025 5:30 AM
Duration: 7 hours 30 minutes
Road: A40 – Roundabout At M40 J1/A40
Category: Road Maintenance
Direction: Clockwise
Carriageway: Dual Carriageway
Lanes affected: Lane 2 closed, 1 of 1 lanes affected, 1 of 3 lanes affected
Reason: Maintenance Work

Active

Planned

Cleared

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First published: Mon, Dec 1, 2025 9:50 PM
Last updated: Tue, Dec 2, 2025 12:50 AM
Cleared: Wed, Dec 3, 2025 5:30 AM

Latest update: A40 Jct Denham roundabout lane closure

Coordinates: 51.562281, -0.497924
Latitude span: 51.561896 – 51.562663
Longitude span: -0.498319 – -0.497542
Bounding box centre: 51.562280, -0.497931
Location descriptions: roundabout at M40 J1/A40

Feed validity status: Planned
Overall feed start: Tue, Dec 2, 2025 10:00 PM
Overall feed end: Wed, Dec 3, 2025 5:30 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

2 coordinate pairs

Description: roundabout at M40 J1/A40
Lane Usage: Cl2
Lane Number: 2
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 0 operational lanes
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: A40
Linear Element Model: The Network Model
Linear Element Id: {3AC1A69E-EACD-41D6-B34A-3A4136AD98EA}
Linear Element Type: Other
From Distance: 0 m
To Distance: 0 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.562658 -0.497542
51.562663 -0.497544

Segment 2

4 coordinate pairs

Description: roundabout at M40 J1/A40
Carriageway: Dual Carriageway
Lane Usage: Cl2
Lane Number: 2
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 1 operational lane
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: A40
Linear Element Model: The Network Model
Linear Element Id: {7E3245F9-FDA3-44ED-A204-D956D43713DC}
Linear Element Type: Other
From Distance: 3 m
To Distance: 22 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.561896 -0.498319
51.561928 -0.498303
51.561953 -0.49829
51.562051 -0.498215

Segment 3

2 coordinate pairs

Description: roundabout at M40 J1/A40
Carriageway: Dual Carriageway
Lane Usage: Cl2
Lane Number: 2
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 1 operational lane
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: A40
Linear Element Model: The Network Model
Linear Element Id: {A2317FCF-EDCE-47B6-B43B-F489D7D70C5C}
Linear Element Type: Other
From Distance: 0 m
To Distance: 11 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.562051 -0.498215
51.562121 -0.498097

Segment 4

4 coordinate pairs

Description: roundabout at M40 J1/A40
Carriageway: Single 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: Clockwise
Direction Relative: Both
Height Grade: Start1 End1
Linear Element Road: A40
Linear Element Model: The Network Model
Linear Element Id: {05C9EE3B-D4CB-4D71-A07C-33CE63B9DD3D}
Linear Element Type: Other
From Distance: 0 m
To Distance: 42 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.562121 -0.498097
51.562325 -0.49786
51.562361 -0.49781
51.562422 -0.497724

Segment 5

3 coordinate pairs

Description: roundabout at M40 J1/A40
Carriageway: Dual Carriageway
Lane Usage: Cl2
Lane Number: 2
Lane Status: Closed
Lane Direction: Aligned
Lanes Restricted: 1 lane restricted
Operational Lanes: 1 operational lane
Direction On Section: Clockwise
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: A40
Linear Element Model: The Network Model
Linear Element Id: {43F990DC-B3EF-44C8-851B-491F68920039}
Linear Element Type: Other
From Distance: 0 m
To Distance: 29 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.562422 -0.497724
51.562588 -0.49757
51.562658 -0.497542

Geometry type: MultiLineString
Geometry points: 15
First coordinate pair: -0.497542, 51.562658
Road section segments: 1
Road section points: 15

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.497542,
                51.562658
            ],
            [
                -0.497544,
                51.562663
            ],
            [
                -0.498319,
                51.561896
            ],
            [
                -0.498303,
                51.561928
            ],
            [
                -0.49829,
                51.561953
            ],
            [
                -0.498215,
                51.562051
            ],
            [
                -0.498215,
                51.562051
            ],
            [
                -0.498097,
                51.562121
            ],
            [
                -0.498097,
                51.562121
            ],
            [
                -0.49786,
                51.562325
            ],
            [
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            ],
            [
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            ],
            [
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            ],
            [
                -0.49757,
                51.562588
            ],
            [
                -0.497542,
                51.562658
            ]
        ]
    ]
}

View road section coordinates

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