A404 northbound to M40 northbound slip road closure

Cleared

Start time: Wed, Jul 29, 2026 8:00 PM
Expected end: Thu, Jul 30, 2026 5:00 AM
Duration: 1 hour 45 minutes 1 second
Road: M40 – Fast Slip From A404 Northbound To M40 Northbound
Category: Road Maintenance
Direction: Northbound
Reason: Maintenance Work

Live incident

Active roadworks

Planned

Cleared

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First published: Wed, Jul 22, 2026 8:14 AM
Last updated: Wed, Jul 29, 2026 9:07 PM
Cleared: Wed, Jul 29, 2026 9:45 PM

Latest update: A404 northbound to M40 northbound slip road closure

Coordinates: 51.610886, -0.770256
Latitude span: 51.609375 – 51.611449
Longitude span: -0.776334 – -0.766885
Bounding box centre: 51.610412, -0.771610
Location descriptions: fast slip from A404 northbound to M40 northbound

M40 J4 northbound access

Feed validity status: Planned
Overall feed start: Wed, Jul 29, 2026 8:00 PM
Overall feed end: Thu, Jul 30, 2026 5:00 AM
Feed window length: 9 hours
Probability code (raw): probable
Compliance option (raw): mandatory
Source identification (raw): roadworks

Management type value: carriagewayClosures (Carriageway Closures)
Contra-flow flag (raw): false
Width restriction flag (raw): false
Height restriction flag (raw): false
Weight restriction flag (raw): false

Segment 1

7 coordinate pairs

Description: fast slip from A404 northbound to M40 northbound
Lanes Restricted: 1 lane restricted
Operational Lanes: 0 operational lanes
Direction On Section: North Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M40
Linear Element Model: The Network Model
Linear Element Id: {7572A8AF-1A04-4C52-B303-50C1A6262A34}
Linear Element Type: Other
From Distance: 12 m
To Distance: 253 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.609375 -0.766885
51.60946 -0.766985
51.609905 -0.767234
51.610264 -0.767534
51.610567 -0.767897
51.610891 -0.768389
51.611092 -0.768883

Segment 2

9 coordinate pairs

Description: M40 J4 northbound access
Lanes Restricted: 2 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: North Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M40
Linear Element Model: The Network Model
Linear Element Id: {2F748F94-9B37-46EB-9B8C-C99FA19BE76C}
Linear Element Type: A Carriageway Entry Slip
From Distance: 0 m
To Distance: 346 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.611092 -0.768883
51.611166 -0.769063
51.611283 -0.769481
51.611401 -0.770059
51.611445 -0.770679
51.611449 -0.771039
51.611429 -0.771561
51.611322 -0.772626
51.611251 -0.773749

Segment 3

3 coordinate pairs

Description: M40 J4 northbound access
Lanes Restricted: 3 lanes restricted
Operational Lanes: 0 operational lanes
Direction On Section: North Bound
Direction Relative: Aligned
Height Grade: Start1 End1
Linear Element Road: M40
Linear Element Model: The Network Model
Linear Element Id: {552A0987-1C8D-49ED-88E4-F2B2640C49E6}
Linear Element Type: A Carriageway Entry Slip
From Distance: 0 m
To Distance: 181 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

51.611251 -0.773749
51.611239 -0.773842
51.610959 -0.776334

Geometry type: MultiLineString
Geometry points: 19
First coordinate pair: -0.766885, 51.609375
Road section segments: 1
Road section points: 19

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.766885,
                51.609375
            ],
            [
                -0.766985,
                51.60946
            ],
            [
                -0.767234,
                51.609905
            ],
            [
                -0.767534,
                51.610264
            ],
            [
                -0.767897,
                51.610567
            ],
            [
                -0.768389,
                51.610891
            ],
            [
                -0.768883,
                51.611092
            ],
            [
                -0.768883,
                51.611092
            ],
            [
                -0.769063,
                51.611166
            ],
            [
                -0.769481,
                51.611283
            ],
            [
                -0.770059,
                51.611401
            ],
            [
                -0.770679,
                51.611445
            ],
            [
                -0.771039,
                51.611449
            ],
            [
                -0.771561,
                51.611429
            ],
            [
                -0.772626,
                51.611322
            ],
            [
                -0.773749,
                51.611251
            ],
            [
                -0.773749,
                51.611251
            ],
            [
                -0.773842,
                51.611239
            ],
            [
                -0.776334,
                51.610959
            ]
        ]
    ]
}

View road section coordinates

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