A1 northbound Tempsford to Black Cat Roundabout carriageway closure

Planned

Start time: Fri, Aug 21, 2026 8:00 PM
Expected end: Mon, Aug 24, 2026 4:00 AM
Duration: 2 days 8 hours
Road: A1 – A1 Northbound At A Minor Junction Between A603 And A421
Category: Construction Work
Direction: Northbound
Carriageway: Dual Carriageway
Reason: Road Improvement Or Upgrading

Live incident

Active roadworks

Planned

Cleared

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First published: Sun, Jun 28, 2026 7:47 PM
Last updated: Fri, Aug 21, 2026 12:22 PM
Cleared: Mon, Aug 24, 2026 4:00 AM

Latest update: A1 northbound Tempsford to Black Cat Roundabout carriageway closure

Coordinates: 52.156733, -0.301856
Latitude span: 52.156231 – 52.157857
Longitude span: -0.302064 – -0.301730
Bounding box centre: 52.157044, -0.301897
Location descriptions: A1 northbound at a minor junction between A603 and A421

A1 northbound between A603 and A421

Feed validity status: Planned
Overall feed start: Fri, Aug 21, 2026 8:00 PM
Overall feed end: Mon, Aug 24, 2026 4:00 AM
Feed window length: 2 days 8 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: A1 northbound at a minor junction between A603 and A421
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: A1
Linear Element Model: The Network Model
Linear Element Id: {39728242-A37B-43C7-8520-E0ED234DD25B}
Linear Element Type: A Carriageway Entry Slip
From Distance: 13 m
To Distance: 84 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

52.156231 -0.302064
52.156238 -0.302044
52.15629 -0.301955
52.156352 -0.301879
52.156406 -0.301848
52.156513 -0.301785
52.156809 -0.30173

Segment 2

4 coordinate pairs

Description: A1 northbound between A603 and A421
Carriageway: Dual Carriageway
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: A1
Linear Element Model: The Network Model
Linear Element Id: {F23DC59D-F402-4BEB-8774-93B0B9B5C7CE}
Linear Element Type: A Carriageway
From Distance: 0 m
To Distance: 116 m
Gml Srs Name: EPSG::4326
Gml Srs Dimension: 2

Raw coordinate list

52.156809 -0.30173
52.156845 -0.301734
52.157709 -0.301813
52.157857 -0.301831

Geometry type: MultiLineString
Geometry points: 11
First coordinate pair: -0.302064, 52.156231
Road section segments: 1
Road section points: 11

View geometry JSON

{
    "type": "MultiLineString",
    "coordinates": [
        [
            [
                -0.302064,
                52.156231
            ],
            [
                -0.302044,
                52.156238
            ],
            [
                -0.301955,
                52.15629
            ],
            [
                -0.301879,
                52.156352
            ],
            [
                -0.301848,
                52.156406
            ],
            [
                -0.301785,
                52.156513
            ],
            [
                -0.30173,
                52.156809
            ],
            [
                -0.30173,
                52.156809
            ],
            [
                -0.301734,
                52.156845
            ],
            [
                -0.301813,
                52.157709
            ],
            [
                -0.301831,
                52.157857
            ]
        ]
    ]
}

View road section coordinates

Cause type: Construction Work
Detailed cause: Road Improvement Or Upgrading
Compliance: Mandatory
Probability: Probable
Validity status: Planned
Road management: Carriageway Closures
Feed region label: northbound at a minor