Crash View

A40 Eastbound Denham Roundabout to Swakeleys carriageway closure

Planned

A40 Eastbound Denham Roundabout to Swakeleys carriageway closure

Start time
Mon, Mar 23, 2026 10:00 PM
Expected end
Tue, Mar 24, 2026 5:30 AM
Duration
7 hours 30 minutes
Road
M40 – M40 Southbound Within J1
Category
Road Maintenance
Direction
Southbound
Carriageway
Dual Carriageway
Reason
Other
Active
Planned
Cleared
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First published
Wed, May 28, 2025 9:59 AM
Last updated
Mon, Mar 23, 2026 6:41 PM
Cleared
Tue, Mar 24, 2026 5:30 AM
  • Latest update: A40 Eastbound Denham Roundabout to Swakeleys carriageway closure
Coordinates
51.560468, -0.485372
Latitude span
51.559528 – 51.561414
Longitude span
-0.493017 – -0.475080
Bounding box centre
51.560471, -0.484049
Location descriptions
  • M40 southbound within J1
  • A40 eastbound between M40 and B467
  • A40 eastbound access from M40
Feed validity status
Planned
Overall feed start
Mon, Mar 23, 2026 10:00 PM
Overall feed end
Tue, Mar 24, 2026 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
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

3 coordinate pairs
Description
M40 southbound within J1
Carriageway
Dual Carriageway
Lanes Restricted
4 lanes restricted
Operational Lanes
0 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 2

3 coordinate pairs
Description
A40 eastbound between M40 and B467
Carriageway
Dual Carriageway
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
142 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.559706 -0.477122
51.55969 -0.476942
51.559528 -0.47508

Segment 3

2 coordinate pairs
Description
A40 eastbound between M40 and B467
Carriageway
Dual Carriageway
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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

Segment 4

4 coordinate pairs
Description
A40 eastbound between M40 and B467
Carriageway
Dual Carriageway
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
265 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
51.560407 -0.485166

Segment 5

2 coordinate pairs
Description
A40 eastbound access from M40
Lanes Restricted
2 lanes restricted
Operational Lanes
0 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
{541770C4-7A25-4CCD-BB85-908AEEB3C09C}
Linear Element Type
B Carriageway Entry Slip
From Distance
29 m
To Distance
38 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.561414 -0.493017
51.561372 -0.492893

Segment 6

3 coordinate pairs
Description
A40 eastbound access from M40
Lanes Restricted
2 lanes restricted
Operational Lanes
0 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
{BF440181-01CA-4C93-AA1A-2C4282CBB030}
Linear Element Type
B Carriageway Entry Slip
From Distance
0 m
To Distance
281 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.561372 -0.492893
51.560998 -0.490445
51.560754 -0.488952

Segment 7

5 coordinate pairs
Description
A40 eastbound between M40 and B467
Carriageway
Dual Carriageway
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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 8

4 coordinate pairs
Description
A40 eastbound between M40 and B467
Carriageway
Dual Carriageway
Lanes Restricted
3 lanes restricted
Operational Lanes
0 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
Geometry type
MultiLineString
Geometry points
26
First coordinate pair
-0.490448, 51.560879
Road section segments
1
Road section points
26
View geometry JSON 
{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.490448,
                51.560879
            ],
            [
                -0.490103,
                51.56085
            ],
            [
                -0.488952,
                51.560754
            ],
            [
                -0.477122,
                51.559706
            ],
            [
                -0.476942,
                51.55969
            ],
            [
                -0.47508,
                51.559528
            ],
            [
                -0.485122,
                51.560403
            ],
            [
                -0.483262,
                51.560238
            ],
            [
                -0.488952,
                51.560754
            ],
            [
                -0.48668,
                51.560545
            ],
            [
                -0.486248,
                51.560503
            ],
            [
                -0.485166,
                51.560407
            ],
            [
                -0.493017,
                51.561414
            ],
            [
                -0.492893,
                51.561372
            ],
            [
                -0.492893,
                51.561372
            ],
            [
                -0.490445,
                51.560998
            ],
            [
                -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
            ]
        ]
    ]
}
View road section coordinates 
[
    [
        [
            -0.490448,
            51.560879
        ],
        [
            -0.490103,
            51.56085
        ],
        [
            -0.488952,
            51.560754
        ],
        [
            -0.477122,
            51.559706
        ],
        [
            -0.476942,
            51.55969
        ],
        [
            -0.47508,
            51.559528
        ],
        [
            -0.485122,
            51.560403
        ],
        [
            -0.483262,
            51.560238
        ],
        [
            -0.488952,
            51.560754
        ],
        [
            -0.48668,
            51.560545
        ],
        [
            -0.486248,
            51.560503
        ],
        [
            -0.485166,
            51.560407
        ],
        [
            -0.493017,
            51.561414
        ],
        [
            -0.492893,
            51.561372
        ],
        [
            -0.492893,
            51.561372
        ],
        [
            -0.490445,
            51.560998
        ],
        [
            -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
        ]
    ]
]
Cause type
Road Maintenance
Detailed cause
Other
Compliance
Mandatory
Probability
Probable
Validity status
Planned
Road management
Carriageway Closures
Feed provider
National Highways
Data source
Roadworks
Feed version
1
Record created
Wed, May 28, 2025 9:59 AM
Record versioned
Mon, Mar 23, 2026 6:41 PM
Coordinate source
Geometry

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