Roadworks and lane closures

M23

1 closure1 booked

1 closure in force on the M23 right now. National Highways has 1 closure booked in the next 24 hours, the first from 9pm tonight. Its slowest recurring hour is Tue 16:00, averaging 52 mph.

Photo: Robin Webster, Geograph, CC BY-SA 2.0, resized

Closed right now

Closure data updated 35 minutes ago2026-10-22T00:38:06.184Z

M23 northbound Jct 10 lane 1 closure and exit slip road

1 lane

M23 J10 northbound exit and 1 more section

3 Mar 2026 to 26 Feb 2027 · 1 lane of the slip road closed, Highways operation

Booked for today and tonight

Next 24 hours, UK time

M23 Southbound Jct 10 entry slip road closure

Booked

M23 J10 southbound access

What: Slip road closed
Why: Highways operation
When: 9pm tonight to 6am tomorrow (UK time)

These are closures National Highways has scheduled, mostly overnight. Plans can change on the night, and a closure only shows above as in force once our last check has seen it set up, so one that has passed its start time may already be in place.

Long-running roadworks on the M23

Lasting a week or more, soonest to end first

M23 northbound Jct 10 24 hour lane 1 closure on exit slip road

in force

M23 J10 northbound exit

Due to end: 1 Mar 2027
Started: 27 Feb 2026
What: 1 lane of the slip road closed, Highways operation

End dates are National Highways’ own schedule and can move. Long-running roadworks on every road.

When the M23 is slowest

1 May 2026 to 15 June 2026

Tue 16:0052mph

21% slower than normal on this stretch · northbound · about 2,299 vehicles an hour

Measured about 900 m from junction 8, Merstham, in Tandridge

Thu 17:0032mph

20% slower than normal on this stretch · southbound · about 871 vehicles an hour

Measured about 200 m from junction 9, Gatwick, in Crawley

Wed 17:0033mph

19% slower than normal on this stretch · southbound · about 816 vehicles an hour

Measured about 200 m from junction 9, Gatwick, in Crawley

Thu 09:0054mph

18% slower than normal on this stretch · northbound · about 2,055 vehicles an hour

Measured about 900 m from junction 8, Merstham, in Tandridge

Tue 17:0056mph

15% slower than normal on this stretch · northbound · about 2,163 vehicles an hour

Measured about 900 m from junction 8, Merstham, in Tandridge

Wed 16:0034mph

15% slower than normal on this stretch · southbound · about 846 vehicles an hour

Measured about 200 m from junction 9, Gatwick, in Crawley

Each hour is compared with that sensor’s own free-flow speed rather than the speed limit, because some sensors sit on bends and slip roads that never reach 70 mph. Quiet hours carrying under 600 vehicles are left out, so overnight roadworks are not mistaken for congestion.

Which direction is worse

Averaged along the whole road

SouthboundWorst at Mon 11:0053 mph

NorthboundWorst at Thu 00:0057 mph

Rush hour is rarely symmetrical. The commute in and the commute out peak at different times, and rarely as badly as each other. These speeds are averaged across every sensor facing that way, so they read higher than the worst-point figures above: most of the road is moving even when one junction is not.

Every hour of the week

Darker means slower

Average speed on the M23 for each hour of the week, shaded by how far below normal it runs.
Day	00	1	2	3	4	5	06	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Mon	Mon 00:00, 60 mph, 3% below normal	Mon 01:00, 59 mph, 3% below normal	Mon 02:00, 59 mph, 3% below normal	Mon 03:00, 59 mph, 3% below normal	Mon 04:00, 60 mph, 2% below normal	Mon 05:00, 61 mph, 1% below normal	Mon 06:00, 60 mph, 2% below normal	Mon 07:00, 59 mph, 3% below normal	Mon 08:00, 59 mph, 4% below normal	Mon 09:00, 59 mph, 4% below normal	Mon 10:00, 57 mph, 6% below normal	Mon 11:00, 57 mph, 8% below normal	Mon 12:00, 58 mph, 5% below normal	Mon 13:00, 59 mph, 4% below normal	Mon 14:00, 59 mph, 3% below normal	Mon 15:00, 60 mph, 2% below normal	Mon 16:00, 60 mph, 3% below normal	Mon 17:00, 60 mph, 2% below normal	Mon 18:00, 61 mph, 0% below normal	Mon 19:00, 61 mph, 0% below normal	Mon 20:00, 61 mph, 0% below normal	Mon 21:00, 60 mph, 2% below normal	Mon 22:00, 59 mph, 3% below normal	Mon 23:00, 59 mph, 4% below normal
Tue	Tue 00:00, 59 mph, 4% below normal	Tue 01:00, 59 mph, 4% below normal	Tue 02:00, 58 mph, 5% below normal	Tue 03:00, 59 mph, 4% below normal	Tue 04:00, 59 mph, 4% below normal	Tue 05:00, 60 mph, 2% below normal	Tue 06:00, 59 mph, 3% below normal	Tue 07:00, 58 mph, 5% below normal	Tue 08:00, 58 mph, 6% below normal	Tue 09:00, 57 mph, 6% below normal	Tue 10:00, 58 mph, 6% below normal	Tue 11:00, 58 mph, 5% below normal	Tue 12:00, 59 mph, 4% below normal	Tue 13:00, 59 mph, 4% below normal	Tue 14:00, 59 mph, 4% below normal	Tue 15:00, 59 mph, 4% below normal	Tue 16:00, 58 mph, 5% below normal	Tue 17:00, 58 mph, 5% below normal	Tue 18:00, 60 mph, 2% below normal	Tue 19:00, 61 mph, 1% below normal	Tue 20:00, 61 mph, 0% below normal	Tue 21:00, 60 mph, 2% below normal	Tue 22:00, 59 mph, 4% below normal	Tue 23:00, 58 mph, 6% below normal
Wed	Wed 00:00, 58 mph, 5% below normal	Wed 01:00, 58 mph, 5% below normal	Wed 02:00, 58 mph, 6% below normal	Wed 03:00, 58 mph, 6% below normal	Wed 04:00, 59 mph, 4% below normal	Wed 05:00, 61 mph, 1% below normal	Wed 06:00, 60 mph, 2% below normal	Wed 07:00, 58 mph, 5% below normal	Wed 08:00, 59 mph, 4% below normal	Wed 09:00, 58 mph, 5% below normal	Wed 10:00, 58 mph, 6% below normal	Wed 11:00, 58 mph, 5% below normal	Wed 12:00, 58 mph, 6% below normal	Wed 13:00, 58 mph, 5% below normal	Wed 14:00, 59 mph, 4% below normal	Wed 15:00, 59 mph, 4% below normal	Wed 16:00, 59 mph, 5% below normal	Wed 17:00, 58 mph, 5% below normal	Wed 18:00, 59 mph, 3% below normal	Wed 19:00, 60 mph, 2% below normal	Wed 20:00, 60 mph, 2% below normal	Wed 21:00, 60 mph, 2% below normal	Wed 22:00, 59 mph, 4% below normal	Wed 23:00, 57 mph, 7% below normal
Thu	Thu 00:00, 57 mph, 7% below normal	Thu 01:00, 57 mph, 7% below normal	Thu 02:00, 58 mph, 5% below normal	Thu 03:00, 57 mph, 6% below normal	Thu 04:00, 58 mph, 5% below normal	Thu 05:00, 60 mph, 1% below normal	Thu 06:00, 60 mph, 2% below normal	Thu 07:00, 59 mph, 4% below normal	Thu 08:00, 58 mph, 5% below normal	Thu 09:00, 56 mph, 8% below normal	Thu 10:00, 58 mph, 6% below normal	Thu 11:00, 58 mph, 6% below normal	Thu 12:00, 58 mph, 5% below normal	Thu 13:00, 59 mph, 4% below normal	Thu 14:00, 58 mph, 5% below normal	Thu 15:00, 59 mph, 4% below normal	Thu 16:00, 58 mph, 5% below normal	Thu 17:00, 58 mph, 6% below normal	Thu 18:00, 59 mph, 4% below normal	Thu 19:00, 61 mph, 1% below normal	Thu 20:00, 60 mph, 1% below normal	Thu 21:00, 59 mph, 3% below normal	Thu 22:00, 58 mph, 4% below normal	Thu 23:00, 58 mph, 4% below normal
Fri	Fri 00:00, 59 mph, 3% below normal	Fri 01:00, 59 mph, 4% below normal	Fri 02:00, 59 mph, 3% below normal	Fri 03:00, 59 mph, 3% below normal	Fri 04:00, 60 mph, 3% below normal	Fri 05:00, 61 mph, 1% below normal	Fri 06:00, 60 mph, 2% below normal	Fri 07:00, 59 mph, 4% below normal	Fri 08:00, 59 mph, 3% below normal	Fri 09:00, 59 mph, 4% below normal	Fri 10:00, 59 mph, 4% below normal	Fri 11:00, 58 mph, 5% below normal	Fri 12:00, 59 mph, 4% below normal	Fri 13:00, 58 mph, 5% below normal	Fri 14:00, 58 mph, 5% below normal	Fri 15:00, 59 mph, 4% below normal	Fri 16:00, 59 mph, 4% below normal	Fri 17:00, 59 mph, 4% below normal	Fri 18:00, 59 mph, 4% below normal	Fri 19:00, 60 mph, 2% below normal	Fri 20:00, 61 mph, 0% below normal	Fri 21:00, 60 mph, 2% below normal	Fri 22:00, 59 mph, 3% below normal	Fri 23:00, 59 mph, 3% below normal
Sat	Sat 00:00, 59 mph, 4% below normal	Sat 01:00, 58 mph, 5% below normal	Sat 02:00, 58 mph, 5% below normal	Sat 03:00, 59 mph, 4% below normal	Sat 04:00, 59 mph, 4% below normal	Sat 05:00, 61 mph, 1% below normal	Sat 06:00, 61 mph, 0% below normal	Sat 07:00, 61 mph, 1% below normal	Sat 08:00, 61 mph, 1% below normal	Sat 09:00, 59 mph, 3% below normal	Sat 10:00, 59 mph, 3% below normal	Sat 11:00, 58 mph, 5% below normal	Sat 12:00, 59 mph, 3% below normal	Sat 13:00, 60 mph, 3% below normal	Sat 14:00, 59 mph, 3% below normal	Sat 15:00, 60 mph, 3% below normal	Sat 16:00, 60 mph, 3% below normal	Sat 17:00, 60 mph, 2% below normal	Sat 18:00, 61 mph, 1% below normal	Sat 19:00, 61 mph, 1% below normal	Sat 20:00, 61 mph, 0% below normal	Sat 21:00, 60 mph, 2% below normal	Sat 22:00, 59 mph, 3% below normal	Sat 23:00, 59 mph, 4% below normal
Sun	Sun 00:00, 59 mph, 3% below normal	Sun 01:00, 60 mph, 3% below normal	Sun 02:00, 59 mph, 4% below normal	Sun 03:00, 59 mph, 4% below normal	Sun 04:00, 60 mph, 3% below normal	Sun 05:00, 61 mph, 0% below normal	Sun 06:00, 61 mph, 0% below normal	Sun 07:00, 61 mph, 0% below normal	Sun 08:00, 61 mph, 1% below normal	Sun 09:00, 60 mph, 2% below normal	Sun 10:00, 58 mph, 5% below normal	Sun 11:00, 58 mph, 6% below normal	Sun 12:00, 58 mph, 5% below normal	Sun 13:00, 59 mph, 3% below normal	Sun 14:00, 60 mph, 2% below normal	Sun 15:00, 60 mph, 2% below normal	Sun 16:00, 60 mph, 2% below normal	Sun 17:00, 60 mph, 2% below normal	Sun 18:00, 61 mph, 1% below normal	Sun 19:00, 61 mph, 1% below normal	Sun 20:00, 61 mph, 0% below normal	Sun 21:00, 60 mph, 1% below normal	Sun 22:00, 60 mph, 2% below normal	Sun 23:00, 60 mph, 3% below normal

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When is the best time to drive the M23?

Roads that meet the M23

Their roadworks and closures

Questions about the M23

Is the M23 closed right now?

1 closure was in force at our last check of the National Highways feed (1:38am today, UK time): M23 northbound Jct 10 lane 1 closure and exit slip road. This covers planned roadworks and lane closures, not accidents.

Is the M23 closed tonight?

National Highways has 1 closure booked on the M23 in the next 24 hours, the first from 9pm tonight: M23 Southbound Jct 10 entry slip road closure. Plans can change on the night.

When will the roadworks on the M23 finish?

One long-running scheme is listed: M23 northbound Jct 10 24 hour lane 1 closure on exit slip road, due to end 1 Mar 2027. End dates are National Highways’ own schedule and can move.