Trunk A-road

A27 traffic and collisions

The A27 is a trunk A-road of 110.9 miles, from East Sussex to Wiltshire. This page covers its traffic at 73 DfT count points since 2000 and the collisions police recorded on it.

Last updated: 15 September 2026
Data source: Department for Transport
Records analysed: 73 count points in 2025
Methodology: View methodology

Traffic in 2025 1.4bn vehicle miles
Average daily traffic 35,484 vehicles a day, both directions
Busiest section 134,038 A3M to A2030
HGV share 3.6% of vehicle miles
Traffic since 2019 −2.5% same count points
Collisions, 2021 to 2025 1,547 22.4 per 100m vehicle miles

How busy is the A27?

On an average day in 2025, 35,484 vehicles passed each point on the A27, counting both directions. The busiest section is A3M to A2030 (Hampshire, Portsmouth), with 134,038 a day; the quietest listed is M3 to Botley Rd, with 7,117.

Busiest sections, 2025

A3M to A2030 carries 3.8 times the road’s average flow.

Sections of the A27 with the highest average daily flow, 2025
Section	Vehicles a day
A3M to A2030 Hampshire, Portsmouth · 1.5 mi · HGVs 4.1%	134,038
A2030 to A3 Portsmouth · 1.0 mi · HGVs 4.5%	121,003
A3023 to A27 spur to A2030 roundabout Hampshire · 1.2 mi · HGVs 3.5%	84,861
A23 to A2038 Brighton and Hove · 1.4 mi · HGVs 2.6%	74,260
A259 to A3023 Hampshire · 0.9 mi · HGVs 4.1%	69,661
A270 to A23 Brighton and Hove · 3.0 mi · HGVs 3.0%	67,669
B2123 to A270 East Sussex, Brighton and Hove · 0.5 mi · HGVs 3.4%	64,955
A270 to A283 West Sussex · 1.2 mi · HGVs 2.5%	64,533
A2038 to A293 Brighton and Hove · 1.7 mi · HGVs 2.9%	63,091
A32 Gosport Rd to A32 Wallington Way Hampshire · 0.6 mi · HGVs 1.8%	62,078

Source:DfT,UK Motoring analysis 2000 to 2025 Updated 15 Sept 2026

Route

East Sussex to Wiltshire · 110.9 miles

Schematic route: each line joins the junctions at the ends of a DfT count point link.

A27 traffic and collisions by section

56 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 10 short link roads and spurs (5.1 miles) count in the road’s totals but are not listed.

Show all 56 sections Tap a column heading to sort

Sections of the A27 in route order, 2025 traffic
#
1	A22 to A259East Sussex	3.1	20,158	2.5%	+5.7%	17	16.2
2	Hailsham Rd to A27(T)East Sussex	2.1	37,913	3.1%	+9.7%	27	20.9
3	A27 Lewes Road to Roundabout A27/A22East Sussex	0.6	30,671	3.8%	–	17	65.3
4	Gainsborough Lane to A22East Sussex	0.2	26,123	4.4%	−5.3%	8	–
5	Drusillas roundabout, Berwick to Gainsborough Lane, PolegateEast Sussex	3.2	23,534	4.4%	−5.3%	36	30.4
6	A26(T) to Drusillas R/AEast Sussex	5.6	23,351	5.0%	−11.4%	65	28.1
7	A26 West to A26 EastEast Sussex	1.4	35,902	4.0%	−2.3%	20	21.5
8	A26 to A277East Sussex	2.2	37,569	4.4%	−14.7%	24	15.1
9	A277 to B2123East Sussex	2.7	58,544	3.6%	+0.8%	37	13.6
10	B2123 to A270East Sussex, Brighton and Hove	0.5	64,955	3.4%	−8.2%	10	17.2
11	A270 to A23Brighton and Hove	3.0	67,669	3.0%	−4.9%	42	11.3
12	A23 to A2038Brighton and Hove	1.4	74,260	2.6%	−11.7%	46	24.2
13	A2038 to A293Brighton and Hove	1.7	63,091	2.9%	−3.0%	30	16.5
14	A293 to A270Brighton and Hove, West Sussex	2.4	48,960	2.9%	−2.4%	16	7.8
15	A270 to A283West Sussex	1.2	64,533	2.5%	−2.6%	30	21.4
16	A283 to A2025West Sussex	1.6	56,514	2.6%	–	39	118.2
17	Sompting Rd to A24West Sussex	2.9	32,657	3.1%	−5.0%	80	41.7
18	A24 to A2031West Sussex	0.7	32,830	3.2%	+6.7%	13	33.7
19	Hollyacres to A24West Sussex	1.2	26,722	3.3%	+17.3%	28	48.3
20	Hollyacres, Worthing to A280West Sussex	1.6	26,243	4.4%	−2.3%	21	28.8
21	A280 to A284West Sussex	3.9	34,224	5.5%	+7.2%	44	18.4
22	A284 Arundel By-pass to A284 Lyminster RdWest Sussex	1.4	33,618	3.7%	+2.7%	26	32.2
23	A29 to A284 roundaboutWest Sussex	3.8	24,049	4.6%	+1.8%	34	18.8
24	A29 west to A29 EastWest Sussex	0.4	43,551	3.8%	−1.5%	17	–
25	A285 to A29West Sussex	3.5	49,129	4.3%	+11.3%	45	16.0
26	A285 W to A285 EWest Sussex	1.5	43,743	3.7%	−6.8%	22	18.9
27	A285 to A259West Sussex	0.9	34,752	5.6%	+2.2%	20	33.8
28	A259 to B2145West Sussex	0.7	40,197	5.5%	−6.2%	38	72.7
29	B2145 to A286West Sussex	0.8	45,978	5.2%	−0.1%	17	25.9
30	A286 to A259West Sussex	0.9	49,584	5.1%	+0.9%	31	40.4
31	A259 Chichester to A259West Sussex, Hampshire	8.3	53,829	5.0%	–	67	9.2
32	A259 to A3023Hampshire	0.9	69,661	4.1%	+0.1%	11	9.9
33	A3023 to A27 spur to A2030 roundaboutHampshire	1.2	84,861	3.5%	+4.5%	14	8.0
34	A27 spur to A2030 roundabout to A3(M)/A27 spurHampshire	0.2	62,893	3.9%	+0.4%	fewer than 3	–
35	A3M to A2030Hampshire, Portsmouth	1.5	134,038	4.1%	−25.2%	47	11.4
36	A2030 to A3Portsmouth	1.0	121,003	4.5%	−7.6%	19	8.5
37	A397 to end of M27Portsmouth	0.5	24,201	4.5%	−7.6%	9	–
38	M27 to M27/A3Portsmouth	1.4	28,924	2.6%	+6.9%	29	40.5
39	M27/A3 to Castle St roundaboutPortsmouth, Hampshire	1.7	24,959	0.8%	+2.5%	43	57.1
40	Castle St roundabout to A27 spur to M27Hampshire	2.3	19,758	0.9%	+6.8%	45	57.3
41	A32 Gosport Rd to A32 Wallington WayHampshire	0.6	62,078	1.8%	+2.2%	18	26.8
42	A32 to B3334Hampshire	2.4	12,104	1.7%	−2.0%	29	57.8
43	B3334 to A27 spur to M27Hampshire	1.9	28,458	1.7%	+1.1%	35	37.1
44	A27 spur to M27 to A3051Hampshire	0.6	27,262	1.2%	−2.8%	7	–
45	A3051 to Portsmouth Road (Old A27)Hampshire	2.5	20,453	0.7%	−2.5%	43	47.9
46	A3024/A3025 to Portsmouth rdHampshire	0.6	13,407	1.7%	−5.1%	9	–
47	A3024 roundabout to A334Hampshire	1.4	11,818	0.4%	−12.5%	16	53.8
48	A334 to B3035 High StHampshire	1.2	13,138	0.7%	−7.2%	28	98.9
49	B3035 High St to A335Hampshire, Southampton	2.0	16,639	0.6%	+13.9%	23	43.5
50	A35/A335 to A35Southampton	0.2	6,440	1.8%	−1.0%	0	–
51	A35 to A33Southampton	1.2	13,379	1.5%	−0.9%	11	40.3
52	M3 to Botley RdHampshire	3.7	7,117	1.7%	−10.5%	31	65.5
53	Botley Rd to A3057Hampshire	1.0	12,122	2.3%	−3.8%	4	–
54	A3057 to A3090Hampshire	1.0	22,517	2.2%	−5.4%	fewer than 3	–
55	At A3090Hampshire	0.8	19,780	2.2%	+4.5%	8	–
56	A3090 to A36Hampshire, Wiltshire	8.6	8,136	2.0%	–	14	22.3

Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A27 as the first road, placed on the nearest section by their recorded position; rates (per 100 million vehicle miles) are shown for sections of half a mile or more with 10 or more.

A27 traffic by vehicle type

Cars and taxis make up 77.0% of the vehicle miles on the A27. HGVs account for 3.6%, rising to 5.6% on A285 to A259.

Vehicle mix, 2025

Share of vehicle miles on the A27 by vehicle type
Category	Share
Cars and taxis	77.0%
Vans (LGVs)	18.5%
HGVs	3.6%
Motorcycles	0.7%
Buses and coaches	0.2%

Source:DfT,UK Motoring analysis 2000 to 2025 Updated 15 Sept 2026

HGV share of traffic

HGVs as a share of vehicle miles on the A27, by year
Year	HGV share
2000	4.9%
2001	5.0%
2002	5.3%
2003	5.4%
2004	5.4%
2005	4.8%
2006	4.6%
2007	4.6%
2008	4.5%
2009	4.1%
2010	4.2%
2011	4.2%
2012	3.9%
2013	3.8%
2014	3.8%
2015	4.0%
2016	4.0%
2017	4.0%
2018	4.0%
2019	3.9%
2020	4.6%
2021	4.3%
2022	3.9%
2023	3.8%
2024	3.7%
2025	3.6%

Source:DfT,UK Motoring analysis 2000 to 2025 Updated 15 Sept 2026

A27 traffic trend

Traffic on the A27 came to 1.44 billion vehicle miles in 2025. At the count points present in both years, it is down 2.5% on 2019, before the pandemic, and about the same as in 2015.

Vehicle miles a year

Like for like, traffic is up 12.4% on 2000.

Vehicle miles on the A27 each year, the whole road as it was that year
Year	Vehicle miles
2000	1.2bn
2001	1.2bn
2002	1.2bn
2003	1.3bn
2004	1.3bn
2005	1.3bn
2006	1.3bn
2007	1.3bn
2008	1.3bn
2009	1.3bn
2010	1.3bn
2011	1.3bn
2012	1.3bn
2013	1.3bn
2014	1.3bn
2015	1.4bn
2016	1.4bn
2017	1.4bn
2018	1.4bn
2019	1.5bn
2020	1.1bn
2021	1.3bn
2022	1.4bn
2023	1.4bn
2024	1.4bn
2025	1.4bn

Source:DfT,UK Motoring analysis 2000 to 2025 Updated 15 Sept 2026

Average daily flow

Average daily flow along the A27, weighted by link length, by year
Year	Vehicles a day
2000	31,087
2001	32,108
2002	32,558
2003	32,922
2004	33,400
2005	33,761
2006	34,274
2007	33,964
2008	33,666
2009	33,700
2010	32,961
2011	33,167
2012	33,849
2013	33,564
2014	33,998
2015	35,270
2016	36,219
2017	36,393
2018	35,674
2019	36,074
2020	27,416
2021	31,220
2022	34,462
2023	35,179
2024	34,890
2025	35,484

Source:DfT,UK Motoring analysis 2000 to 2025 Updated 15 Sept 2026

The chart counts the whole road as it was each year, so new or renumbered stretches move it. The percentage changes compare only count points present in both years (89.9% of today’s road for 2019). In 2025, 37 of the 73 count points were counted; DfT estimated the rest from earlier counts and local trends.

A27 collisions

Police recorded 1,547 collisions with the A27 as the first road from 2021 to 2025, 358 of them fatal or serious, including 25 fatal. That is 22.4 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 2.8 a year for each mile of road.

Reported collisions by year

Down 3.0% from 2021 to 2025.

Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated 15 Sept 2026

Sections with the highest collision rates

Per 100 million vehicle miles, 2021 to 2025. Sections of half a mile or more with 10 or more collisions.

Collisions per 100 million vehicle miles by section of the A27, 2021 to 2025
Section	Per 100m vehicle miles
A283 to A2025 West Sussex · 39 collisions	118.2
A334 to B3035 High St Hampshire · 28 collisions	98.9
A259 to B2145 West Sussex · 38 collisions	72.7
M3 to Botley Rd Hampshire · 31 collisions	65.5
A27 Lewes Road to Roundabout A27/A22 East Sussex · 17 collisions	65.3
A32 to B3334 Hampshire · 29 collisions	57.8
Castle St roundabout to A27 spur to M27 Hampshire · 45 collisions	57.3
M27/A3 to Castle St roundabout Portsmouth, Hampshire · 43 collisions	57.1

Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated 15 Sept 2026

A further 172 collisions were recorded at junctions where the A27 was the second road; they are not in the figures above. Fatal or serious uses DfT’s adjusted serious figures. How we count collisions

Council areas on the A27

In route order. Each is the highway authority DfT files the count points under.

East Sussex
Brighton and Hove
West Sussex
Hampshire
Portsmouth
Southampton
Wiltshire

Planned closures on the A27 in England

National Highways has 37 planned closures on the A27 between 16 September 2026 and 30 September 2026, all of them starting in that period. 31 close a carriageway rather than a lane or slip road, and 37 start between 7pm and 6am.

Carriageway A27 eastbound Fishbourne roundabout to Portfield roundabout carriageway closure

16 Sept 20:00 to 17 Sept 06:00 Road maintenance
Carriageway A27 eastbound Fishbourne roundabout to Bognor road carriageway closure

16 Sept 20:00 to 23 Sept 06:00 Road maintenance
Carriageway A27 eastbound Fishbourne roundabout to Portfield roundabout carriageway closure

16 Sept 20:00 to 25 Sept 06:00 Road maintenance
Carriageway A27 westbound Clapham entry slip road closure

16 Sept 20:00 to 17 Sept 05:00 Road maintenance
Carriageway A27 eastbound Langstone carriageway closure between the exit and entry slip roads

16 Sept 20:00 to 24 Sept 06:00 Road maintenance
Carriageway A27 eastbound Langstone carriageway closure between the exit and entry slip roads

16 Sept 20:00 to 25 Sept 06:00 Road maintenance
Carriageway A27 eastbound Eastern Road exit slip road closure

16 Sept 21:00 to 17 Sept 06:00 Road maintenance
Carriageway A27 eastbound Langstone carriageway closure between the exit and entry slip roads

16 Sept 21:00 to 22 Sept 06:00 Road maintenance

29 more planned closures in this period are not shown.

Planned closures only: National Highways can cancel or change them, and closures caused by incidents are not shown. Council roads in England are not covered. Roadworks and closures across the UK

Source:National Highways 2026-09-16 to 2026-09-30 Updated 16 Sept 2026

Data sources and methodology

Datasets used on this page
Figures	Source	Period	Records	Updated
Traffic counts and vehicle mix	Road traffic statistics (AADF by count point) Department for Transport Derived statistics UK Motoring	2000 to 2025	73 count points in 2025	15 September 2026
Reported collisions	Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring	2021 to 2025	1,547 reported collisions	15 September 2026
Planned closures	Transport Data Feeds (DATEX II) National Highways	2026-09-16 to 2026-09-30	2,304 planned closure schemes	16 September 2026

Annual average daily flow (AADF) is the average number of vehicles passing a point on a typical day of the year, both directions combined.
Vehicle miles are AADF multiplied by link length and 365, summed over every count point link on the road.
Sections join count point links between junctions, using the link lines in DfT’s major road database.
STATS19 covers personal injury collisions reported to the police. Damage-only collisions are not included, and not every injury collision is reported.
Serious and slight figures are DfT’s adjusted estimates, which allow for police forces moving to injury-based reporting.
Counts of one or two collisions below Great Britain level are shown as “fewer than 3”.

How we calculate these figures All data sources

Contains public sector information licensed under the Open Government Licence v3.0.

How busy is the A27?

Route

A27 traffic and collisions by section

A27 traffic by vehicle type

A27 traffic trend

A27 collisions

Council areas on the A27

Roads that meet the A27

Planned closures on the A27 in England

Data sources and methodology

Related statistics