Trunk A-road

A361 traffic and collisions

The A361 is a trunk A-road of 174.1 miles, from Swindon to Devon. This page covers its traffic at 60 DfT count points since 2000 and the collisions police recorded on it.

Last updated: 15 September 2026
Data source: Department for Transport
Records analysed: 60 count points in 2025
Methodology: View methodology

Traffic in 2025 709m vehicle miles
Average daily traffic 11,153 vehicles a day, both directions
Busiest section 32,974 M5 to A396
HGV share 5.6% of vehicle miles
Traffic since 2019 −0.7% same count points
Collisions, 2021 to 2025 772 23.3 per 100m vehicle miles

How busy is the A361?

On an average day in 2025, 11,153 vehicles passed each point on the A361, counting both directions. The busiest section is M5 to A396 (Devon), with 32,974 a day; the quietest listed is A39 to A372, with 4,775.

Busiest sections, 2025

M5 to A396 carries 3.0 times the road’s average flow.

Sections of the A361 with the highest average daily flow, 2025
Section	Vehicles a day
M5 to A396 Devon · 5.3 mi · HGVs 5.3%	32,974
A377 to A39 Devon · 0.5 mi · HGVs 3.7%	27,456
A39 to A3125 Devon · 0.9 mi · HGVs 3.7%	23,338
A396 to A3126 Bolham Road Devon · 1.2 mi · HGVs 5.9%	21,792
A36 to B3090 Somerset · 0.8 mi · HGVs 7.7%	21,474
Devizes Rd to B3105 Wiltshire · 1.1 mi · HGVs 2.4%	20,382
At B4100 Oxfordshire · 0.5 mi · HGVs 3.1%	20,272
A361 spur to B4141 Swindon · 0.6 mi · HGVs 7.3%	19,765
A350 to Devizes Rd Wiltshire · 1.2 mi · HGVs 2.0%	19,158
B3109 to A36 Somerset · 0.9 mi · HGVs 6.7%	18,177

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

Route

Swindon to Devon · 174.1 miles in 3 stretches

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

A361 traffic and collisions by section

52 sections between junctions, in route order (3 separate stretches). Each is the average of its DfT count points, weighted by length. 2 short link roads and spurs (1.0 miles) count in the road’s totals but are not listed.

Show all 52 sections Tap a column heading to sort

Sections of the A361 in route order, 2025 traffic
#
1	A361 main route to A419Swindon · stretch 1	0.4	10,368	10.3%	−15.3%	fewer than 3	–
2	A361 spur to B4141Swindon · stretch 1	0.6	19,765	7.3%	−2.1%	5	–
3	B4141 to B4000Swindon · stretch 1	2.8	12,913	2.3%	−7.2%	17	26.8
4	B4019 to A417Swindon, Gloucestershire · stretch 1	4.8	8,749	2.0%	−6.2%	20	27.1
5	A417 High St to A417 St Johns StGloucestershire · stretch 1	0.1	11,502	4.3%	−7.6%	fewer than 3	–
6	A417 to A40Gloucestershire, Oxfordshire · stretch 1	8.2	6,224	4.1%	−4.8%	16	17.9
7	A40(T) to A424Oxfordshire · stretch 1	0.6	12,847	2.7%	−1.3%	5	–
8	A424 to A44Oxfordshire · stretch 1	10.6	5,299	3.1%	+10.2%	34	39.1
9	A3400 to B 4022Oxfordshire · stretch 1	4.2	6,872	4.4%	−6.1%	8	–
10	B4022 to B4031Oxfordshire · stretch 1	0.5	8,331	4.9%	−6.5%	fewer than 3	–
11	Old Toll Gate (B4031) to Waller Drive, BanburyOxfordshire · stretch 1	6.0	5,471	3.5%	–	23	95.6
12	Waller Drive to B4100Oxfordshire · stretch 1	0.9	12,384	2.2%	−5.4%	11	55.8
13	At B4100Oxfordshire · stretch 1	0.5	20,272	3.1%	+3.1%	17	98.0
14	A422 to Castle StOxfordshire · stretch 1	0.7	12,337	3.4%	−5.1%	7	–
15	M40 to Daventry (Stefen Way)Oxfordshire, West Northamptonshire · stretch 1	15.1	6,741	3.8%	–	48	30.9
16	A45(T) to A425West Northamptonshire · stretch 1	0.9	8,703	7.2%	−5.5%	7	–
17	A425 to A5(T)West Northamptonshire · stretch 1	4.3	8,439	9.6%	+12.6%	21	33.9
18	A4 to Horton RoadWiltshire · stretch 2	5.7	8,683	5.4%	−6.0%	16	18.4
19	Horton Road to A342Wiltshire · stretch 2	1.4	15,504	2.7%	−2.6%	24	62.6
20	A342 to A360Wiltshire · stretch 2	0.4	15,299	3.6%	−5.1%	10	–
21	A360 to A342Wiltshire · stretch 2	0.3	20,452	3.0%	−0.1%	5	–
22	A342 to Mayenne PlaceWiltshire · stretch 2	0.7	12,065	3.9%	−5.1%	7	–
23	Mayenne Place, Devizes to A365Wiltshire · stretch 2	2.0	12,876	3.6%	−2.6%	14	31.0
24	A365 to A350Wiltshire · stretch 2	3.9	9,323	4.5%	+7.4%	23	36.1
25	At A350Wiltshire · stretch 2	0.4	15,632	2.0%	−9.3%	fewer than 3	–
26	A350 to Devizes RdWiltshire · stretch 2	1.2	19,158	2.0%	+16.4%	6	–
27	Devizes Rd to B3105Wiltshire · stretch 2	1.1	20,382	2.4%	+14.4%	7	–
28	B3105 to A363 West TrowbridgeWiltshire · stretch 2	1.5	15,256	1.7%	−5.5%	19	47.0
29	A363 Bradley Rd to A363 Bythesea Road roundaboutWiltshire · stretch 2	0.5	15,697	2.3%	−15.5%	10	72.0
30	Bradley Road to Silver Street LaneWiltshire · stretch 2	0.7	13,161	2.0%	−0.7%	13	82.2
31	Silver Street Lane to B3109Wiltshire, Somerset · stretch 2	2.8	13,616	8.0%	+2.4%	21	31.3
32	B3109 to A36Somerset · stretch 2	0.9	18,177	6.7%	−3.7%	5	–
33	A36 to B3090Somerset · stretch 2	0.8	21,474	7.7%	+1.2%	fewer than 3	–
34	B3090 to A362Somerset · stretch 2	2.5	15,233	10.1%	+12.9%	8	–
35	A362 to A359Somerset · stretch 2	4.5	17,819	10.1%	–	26	18.8
36	A359 to A361 splitSomerset · stretch 2	7.3	11,004	13.9%	−11.2%	22	15.4
37	A361 split to A37Somerset · stretch 2	0.3	6,229	5.7%	−4.9%	fewer than 3	–
38	A37 to B3136Somerset · stretch 2	0.6	5,523	1.1%	−5.2%	8	–
39	A37 to A39Somerset · stretch 2	9.2	7,515	7.2%	−5.5%	35	28.8
40	A39 to A372Somerset · stretch 2	5.3	4,775	2.8%	−12.2%	13	28.1
41	At A372Somerset · stretch 2	0.1	7,323	4.3%	−6.6%	0	–
42	A372 to A38Somerset · stretch 2	7.6	7,326	2.6%	−6.1%	22	22.5
43	M5 to A396Devon · stretch 3	5.3	32,974	5.3%	+7.2%	24	7.6
44	A396 to A3126 Bolham RoadDevon · stretch 3	1.2	21,792	5.9%	−10.3%	3	–
45	A396 Bolham Road to B3227Devon · stretch 3	15.7	17,390	5.4%	+7.0%	29	7.0
46	B3227 to A399Devon · stretch 3	3.4	13,356	8.3%	−15.1%	14	16.1
47	A399 to A39(T)Devon · stretch 3	8.5	16,121	6.4%	–	33	66.0
48	A361 to A377Devon · stretch 3	0.9	17,963	4.5%	+17.2%	7	–
49	A377 to A39Devon · stretch 3	0.5	27,456	3.7%	−5.9%	7	–
50	A39 to A3125Devon · stretch 3	0.9	23,338	3.7%	−5.2%	6	–
51	A3125 to A3123/B3343Devon · stretch 3	10.9	7,086	4.6%	−5.9%	28	20.7
52	B3230 to B3343Devon · stretch 3	2.9	7,086	2.2%	−5.7%	15	41.3

Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A361 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.

A361 traffic by vehicle type

Cars and taxis make up 74.9% of the vehicle miles on the A361. HGVs account for 5.6%, rising to 13.9% on A359 to A361 split.

Vehicle mix, 2025

Share of vehicle miles on the A361 by vehicle type
Category	Share
Cars and taxis	74.9%
Vans (LGVs)	18.6%
HGVs	5.6%
Motorcycles	0.6%
Buses and coaches	0.3%

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 A361, by year
Year	HGV share
2000	7.6%
2001	7.2%
2002	6.9%
2003	6.8%
2004	6.7%
2005	6.8%
2006	6.7%
2007	6.9%
2008	6.3%
2009	5.8%
2010	5.7%
2011	6.3%
2012	6.2%
2013	6.2%
2014	6.1%
2015	6.2%
2016	5.9%
2017	5.9%
2018	6.1%
2019	6.0%
2020	7.2%
2021	6.8%
2022	6.3%
2023	6.1%
2024	6.0%
2025	5.6%

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

A361 traffic trend

Traffic on the A361 came to 709 million vehicle miles in 2025. At the count points present in both years, it is down 0.7% on 2019, before the pandemic, and up 12.0% on 2015.

Vehicle miles a year

Like for like, traffic is up 26.5% on 2000.

Vehicle miles on the A361 each year, the whole road as it was that year
Year	Vehicle miles
2000	564m
2001	585m
2002	622m
2003	602m
2004	624m
2005	638m
2006	624m
2007	620m
2008	640m
2009	640m
2010	635m
2011	606m
2012	607m
2013	607m
2014	616m
2015	631m
2016	675m
2017	683m
2018	694m
2019	709m
2020	537m
2021	608m
2022	662m
2023	666m
2024	674m
2025	709m

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

Average daily flow

Average daily flow along the A361, weighted by link length, by year
Year	Vehicles a day
2000	8,959
2001	9,286
2002	9,861
2003	9,551
2004	9,897
2005	10,138
2006	9,929
2007	9,847
2008	10,125
2009	10,130
2010	10,063
2011	9,596
2012	9,612
2013	9,602
2014	9,753
2015	9,992
2016	10,689
2017	10,793
2018	10,946
2019	11,216
2020	8,481
2021	9,599
2022	10,441
2023	10,505
2024	10,623
2025	11,153

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 (82.9% of today’s road for 2019). In 2025, 9 of the 60 count points were counted; DfT estimated the rest from earlier counts and local trends.

A361 collisions

Police recorded 772 collisions with the A361 as the first road from 2021 to 2025, 214 of them fatal or serious. That is 23.3 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 0.9 a year for each mile of road.

Reported collisions by year

Up 6.8% 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 A361, 2021 to 2025
Section	Per 100m vehicle miles
At B4100 Oxfordshire · 17 collisions	98.0
Old Toll Gate (B4031) to Waller Drive, Banbury Oxfordshire · 23 collisions	95.6
Bradley Road to Silver Street Lane Wiltshire · 13 collisions	82.2
A363 Bradley Rd to A363 Bythesea Road roundabout Wiltshire · 10 collisions	72.0
A399 to A39(T) Devon · 33 collisions	66.0
Horton Road to A342 Wiltshire · 24 collisions	62.6
Waller Drive to B4100 Oxfordshire · 11 collisions	55.8
B3105 to A363 West Trowbridge Wiltshire · 19 collisions	47.0

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

A further 80 collisions were recorded at junctions where the A361 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 A361

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

Swindon
Gloucestershire
Oxfordshire
West Northamptonshire
Wiltshire
Somerset
Devon

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	60 count points in 2025	15 September 2026
Reported collisions	Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring	2021 to 2025	772 reported collisions	15 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 A361?

Route

A361 traffic and collisions by section

A361 traffic by vehicle type

A361 traffic trend

A361 collisions

Council areas on the A361

Roads that meet the A361

Data sources and methodology

Related statistics