A-road
A358 traffic and collisions
The A358 is an A-road of 43.2 miles, from Devon to Somerset. This page covers its traffic at 18 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 218m vehicle miles
- Average daily traffic 13,805 vehicles a day, both directions
- Busiest section 47,527 M5 to A38
- HGV share 4.5% of vehicle miles
- Traffic since 2019 −1.7% same count points
- Collisions, 2021 to 2025 207 20.1 per 100m vehicle miles
How busy is the A358?
On an average day in 2025, 13,805 vehicles passed each point on the A358, counting both directions. The busiest section is M5 to A38 (Somerset), with 47,527 a day; the quietest listed is B3224 to A39, with 7,030.
Busiest sections, 2025
M5 to A38 carries 3.4 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| M5 to A38 Somerset · 0.9 mi · HGVs 2.3% | 47,527 |
| M5 J25 to Junction A378/A358 Somerset · 2.8 mi · HGVs 6.7% | 30,720 |
| A38 to A3259 Somerset · 0.6 mi · HGVs 2.3% | 25,139 |
| A303 to A378 Somerset · 6.5 mi · HGVs 7.3% | 22,759 |
| A3027 to A3065 Somerset · 0.6 mi · HGVs 1.9% | 22,479 |
| A3259 to A3038 roundabout Somerset · 0.7 mi · HGVs 2.0% | 16,798 |
| B3227 to Dene Road roundabout Somerset · 2.2 mi · HGVs 3.3% | 13,765 |
| Thorndun Park Drive to A30 Somerset · 2.1 mi · HGVs 3.7% | 13,702 |
| Dene Road roundabout to B3224 Somerset · 1.7 mi · HGVs 2.6% | 12,023 |
| A30 to Thorndun Park Drive Somerset · 0.9 mi · HGVs 3.3% | 10,843 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Devon to Somerset · 43.2 miles
A358 traffic and collisions by section
18 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length.
Show all 18 sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A3052 to A358 spurDevon | 7,766 | 16 |
| 2 | A358 spur to B3167Devon | 7,508 | 25 |
| 3 | B3167 to HalcombeSomerset | 8,240 | 12 |
| 4 | Halcombe to A30Somerset | 9,661 | 4 |
| 5 | A30 to Thorndun Park DriveSomerset | 10,843 | 7 |
| 6 | Thorndun Park Drive to A30Somerset | 13,702 | 6 |
| 7 | C road to Dowlish Ford to A303Somerset | 9,785 | fewer than 3 |
| 8 | A303 to A378Somerset | 22,759 | 26 |
| 9 | M5 J25 to Junction A378/A358Somerset | 30,720 | 21 |
| 10 | M5 to A38Somerset | 47,527 | 17 |
| 11 | A38 to A3259Somerset | 25,139 | 8 |
| 12 | A3259 to A3038 roundaboutSomerset | 16,798 | 5 |
| 13 | A3038 roundabout to A3027Somerset | 10,209 | 5 |
| 14 | A3027 to A3065Somerset | 22,479 | fewer than 3 |
| 15 | A3065 to B3227Somerset | 23,739 | 0 |
| 16 | B3227 to Dene Road roundaboutSomerset | 13,765 | 16 |
| 17 | Dene Road roundabout to B3224Somerset | 12,023 | 9 |
| 18 | B3224 to A39Somerset | 7,030 | 27 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A358 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.
A358 traffic by vehicle type
Cars and taxis make up 77.6% of the vehicle miles on the A358. HGVs account for 4.5%, rising to 7.3% on A303 to A378.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 6.4% |
| 2001 | 6.6% |
| 2002 | 6.9% |
| 2003 | 6.1% |
| 2004 | 6.0% |
| 2005 | 5.7% |
| 2006 | 5.5% |
| 2007 | 5.9% |
| 2008 | 5.7% |
| 2009 | 5.4% |
| 2010 | 5.3% |
| 2011 | 5.2% |
| 2012 | 5.1% |
| 2013 | 4.9% |
| 2014 | 4.9% |
| 2015 | 5.2% |
| 2016 | 5.0% |
| 2017 | 5.0% |
| 2018 | 5.0% |
| 2019 | 5.0% |
| 2020 | 6.3% |
| 2021 | 6.2% |
| 2022 | 5.6% |
| 2023 | 4.7% |
| 2024 | 4.5% |
| 2025 | 4.5% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A358 traffic trend
Traffic on the A358 came to 218 million vehicle miles in 2025. At the count points present in both years, it is down 1.7% on 2019, before the pandemic, and up 2.5% on 2015.
Vehicle miles a year
Like for like, traffic is up 9.1% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 193m |
| 2001 | 194m |
| 2002 | 200m |
| 2003 | 199m |
| 2004 | 196m |
| 2005 | 201m |
| 2006 | 199m |
| 2007 | 198m |
| 2008 | 201m |
| 2009 | 204m |
| 2010 | 201m |
| 2011 | 202m |
| 2012 | 202m |
| 2013 | 201m |
| 2014 | 199m |
| 2015 | 204m |
| 2016 | 212m |
| 2017 | 216m |
| 2018 | 217m |
| 2019 | 218m |
| 2020 | 166m |
| 2021 | 183m |
| 2022 | 205m |
| 2023 | 210m |
| 2024 | 215m |
| 2025 | 218m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 12,331 |
| 2001 | 12,429 |
| 2002 | 12,823 |
| 2003 | 12,710 |
| 2004 | 12,517 |
| 2005 | 12,852 |
| 2006 | 12,746 |
| 2007 | 12,648 |
| 2008 | 12,868 |
| 2009 | 13,074 |
| 2010 | 12,878 |
| 2011 | 12,937 |
| 2012 | 12,896 |
| 2013 | 12,838 |
| 2014 | 12,758 |
| 2015 | 13,055 |
| 2016 | 13,598 |
| 2017 | 13,854 |
| 2018 | 13,872 |
| 2019 | 13,932 |
| 2020 | 10,622 |
| 2021 | 11,698 |
| 2022 | 12,970 |
| 2023 | 13,308 |
| 2024 | 13,661 |
| 2025 | 13,805 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
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. In 2025, 0 of the 18 count points were counted; DfT estimated the rest from earlier counts and local trends.
A358 collisions
Police recorded 207 collisions with the A358 as the first road from 2021 to 2025, 63 of them fatal or serious, including 4 fatal. That is 20.1 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 1.0 a year for each mile of road.
Reported collisions by year
Up 37.1% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 22 | 13 |
| 2022 | 21 | 13 |
| 2023 | 37 | 11 |
| 2024 | 29 | 13 |
| 2025 | 35 | 13 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
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.
| Section | Per 100m vehicle miles |
|---|---|
| A358 spur to B3167 Devon · 25 collisions | 39.6 |
| B3167 to Halcombe Somerset · 12 collisions | 35.5 |
| A3052 to A358 spur Devon · 16 collisions | 34.8 |
| B3227 to Dene Road roundabout Somerset · 16 collisions | 30.1 |
| B3224 to A39 Somerset · 27 collisions | 23.1 |
| M5 to A38 Somerset · 17 collisions | 23.0 |
| M5 J25 to Junction A378/A358 Somerset · 21 collisions | 17.1 |
| A303 to A378 Somerset · 26 collisions | 10.0 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 30 collisions were recorded at junctions where the A358 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 A358
In route order. Each is the highway authority DfT files the count points under.
- Devon
- Somerset
Data sources and methodology
| 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 | 18 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 207 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”.
Contains public sector information licensed under the Open Government Licence v3.0.