🚨 Emergency? Call 999 · Motorway breakdown? 0300 123 5000
Search
LIVE
Loading incidents...

Start typing to search

Find traffic updates, service providers, tools & more

📢 Seen an incident on this road? Report it in 30 seconds Report ›
Live from National Highways

A421 roadworks and closures

Closures tonight, this weekend and the next two weeks, plus the works running now on the A421, straight from National Highways.

0Running now
0Full closures tonight 1Full closures this weekend
Home › Traffic › Roads › A421 › Roadworks & closures

Is the A421 closed? Quick answers

Checked 13:58 on Tuesday 3 November 2026.

Is the A421 closed tonight?

No. No closures are planned on the A421 tonight (Tue 3 Nov, 18:00 to 06:00).

Tonight's A421 closures ›

Is the A421 closed this weekend?

Yes. The A421 has 1 full closure planned this weekend (Fri 6 Nov 18:00 to Mon 9 Nov 06:00): westbound Black Cat Roundabout to Water End Interchange carriageway closure, from Fri 6 Nov 21:00, until Mon 9 Nov 05:00. Diversion: diversion routes for construction - bypass/new on behalf of National Highways.

This weekend's A421 closures ›

Are there roadworks on the A421 right now?

No. Nothing is running on the A421 at 13:58.

Works running now ›

From National Highways' closure report and live feed. Full closure means the carriageway is shut; lane and slip road closures leave it open. Times can change, so check before you set off.

A421 closures tonightTue 3 Nov, 18:00 to 06:00

No. No closures are planned on the A421 tonight (Tue 3 Nov, 18:00 to 06:00).

A421 closures this weekendFri 6 Nov 18:00 to Mon 9 Nov 06:00

Yes. The A421 has 1 full closure planned this weekend (Fri 6 Nov 18:00 to Mon 9 Nov 06:00): westbound Black Cat Roundabout to Water End Interchange carriageway closure, from Fri 6 Nov 21:00, until Mon 9 Nov 05:00. Diversion: diversion routes for construction - bypass/new on behalf of National Highways.

  • Full closureWestboundFrom Fri 6 Nov 21:00, until Mon 9 Nov 05:00
    Black Cat Roundabout to Water End Interchange carriageway closure
    Overall Scheme Details: A1 / A421 both directions Biggleswade to St Neots - carriageway closures, lane closures, narrow lanes, permanent layby closures and
    Diversion: diversion routes for construction - bypass/new on behalf of National Highways

A421 roadworks running now

✅ No roadworks on the A421 right now

Nothing is running on the A421 at 13:58. Planned closures are listed by night on this page.

A421 live traffic →

A421 closures in the next 2 weeksOther nights, as far ahead as National Highways have published (to Mon 9 Nov)

No other A421 closures are published yet.

❓ A421 roadworks — Frequently Asked Questions

Are there roadworks on the A421 right now?

No roadworks are currently running on the A421 according to National Highways.

Is the A421 closed tonight?

No. No closures are planned on the A421 tonight (Tue 3 Nov, 18:00 to 06:00).

Is the A421 closed this weekend?

Yes. The A421 has 1 full closure planned this weekend (Fri 6 Nov 18:00 to Mon 9 Nov 06:00): westbound Black Cat Roundabout to Water End Interchange carriageway closure, from Fri 6 Nov 21:00, until Mon 9 Nov 05:00. Diversion: diversion routes for construction - bypass/new on behalf of National Highways.

When are A421 roadworks usually carried out?

Most National Highways lane closures on the A421 run overnight and are lifted before the morning peak (07:00–09:00). Full carriageway closures are usually weekend nights, with a signed diversion.

🛣️ Data from National Highways · All UK roadworks · Overnight closures · A421 live traffic
Roadworks change at short notice. Always follow signs and signals on the road.

🚗 A421 pages

A421 live traffic →

A421 Trunk Road · 25 miles. Live incidents, junction status and collision history.

🚧 Roadworks elsewhere

🇬🇧 All UK roadworks → 🌙 Motorway closures tonight & this weekend → 🚧 M1 roadworks → 🚧 A6 roadworks → 🚧 A428 roadworks →

🚛 Car recovery along the A421

Broken down on the A421? Pick the nearest town and call a local firm direct:

On a motorway? If you can, get onto the hard shoulder or into an emergency area, leave by the left-hand doors and wait behind the barrier. Stuck in a live lane: stay in the car with your seatbelt on and hazard lights on, and call 999.

🆘 Send one free requestAll breakdown services