A40 Eastbound Denham entry slip road lane 1 closure

Planned

Start time: Thu, Oct 22, 2026 10:59 PM
Expected end: Fri, Oct 23, 2026 4:30 AM
Duration: 5 hours 31 minutes
Road: M40 – M40 J1 Southbound Exit
Category: Road Maintenance
Direction: Southbound
Lanes affected: 1 of 1 lanes affected
Reason: Maintenance Work

Live incident

Active roadworks

Planned

Cleared

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First published: Thu, Oct 22, 2026 8:59 PM
Last updated: Thu, Oct 22, 2026 10:05 PM
Cleared: Fri, Oct 23, 2026 4:30 AM

Latest update: A40 Eastbound Denham entry slip road lane 1 closure

Coordinates: 51.561976, -0.499012
Latitude span: 51.561878 – 51.562075
Longitude span: -0.499732 – -0.498412
Bounding box centre: 51.561977, -0.499072
Location descriptions: M40 J1 southbound exit

Feed validity status: Planned
Overall feed start: Thu, Oct 22, 2026 10:59 PM
Overall feed end: Fri, Oct 23, 2026 4:30 AM
Feed window length: 5 hours 31 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: M40 J1 southbound exit
Lanes Restricted: 1 lane restricted
Operational Lanes: 1 operational lane
Direction On Section: South Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M40
Linear Element Model: The Network Model
Linear Element Id: {51B92E59-EB65-46B5-9609-84ABF5D94F92}
Linear Element Type: B Carriageway Exit Slip
From Distance: 0 m
To Distance: 26 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.56195 -0.498781
51.561892 -0.498484
51.561878 -0.498412

Segment 2

4 coordinate pairs

Description: M40 J1 southbound exit
Lanes Restricted: 1 lane restricted
Operational Lanes: 1 operational lane
Direction On Section: South Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M40
Linear Element Model: The Network Model
Linear Element Id: {B58F8180-E638-409C-B3AA-C7F41C33E136}
Linear Element Type: B Carriageway Exit Slip
From Distance: 530 m
To Distance: 598 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.562075 -0.499732
51.562059 -0.499585
51.562029 -0.499312
51.56195 -0.498781

Geometry type: MultiLineString
Geometry points: 7
First coordinate pair: -0.498781, 51.561950
Road section segments: 1
Road section points: 7

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.498781,
                51.56195
            ],
            [
                -0.498484,
                51.561892
            ],
            [
                -0.498412,
                51.561878
            ],
            [
                -0.499732,
                51.562075
            ],
            [
                -0.499585,
                51.562059
            ],
            [
                -0.499312,
                51.562029
            ],
            [
                -0.498781,
                51.56195
            ]
        ]
    ]
}

View road section coordinates

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