A-road
A370 traffic and collisions
The A370 is an A-road of 30.2 miles, from City of Bristol to Somerset. This page covers its traffic at 21 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 208m vehicle miles
- Average daily traffic 18,905 vehicles a day, both directions
- Busiest section 40,208 A369/A3029 midpoint to B3130 Barrow Street
- HGV share 2.4% of vehicle miles
- Traffic since 2019 −1.8% same count points
- Collisions, 2021 to 2025 273 27.6 per 100m vehicle miles
How busy is the A370?
On an average day in 2025, 18,905 vehicles passed each point on the A370, counting both directions. The busiest section is A369/A3029 midpoint to B3130 Barrow Street (City of Bristol, North Somerset), with 40,208 a day; the quietest listed is A3033 Devonshire Road to Carlton Street, with 12,000.
Busiest sections, 2025
A369/A3029 midpoint to B3130 Barrow Street carries 2.1 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A369/A3029 midpoint to B3130 Barrow Street City of Bristol, North Somerset · 0.9 mi · HGVs 2.8% | 40,208 |
| A371 Locking Moor Road to M5 J 21 North Somerset · 2.2 mi · HGVs 3.4% | 36,194 |
| A3033 Drove Road to A371 North Somerset · 2.4 mi · HGVs 1.1% | 32,596 |
| Bleadon Hill to B3140 North Somerset, Somerset · 4.6 mi · HGVs 2.1% | 17,050 |
| A3029/B3120 to A38 roundabout City of Bristol · 1.2 mi · HGVs 3.6% | 16,602 |
| A3033 to Bleadon Hill North Somerset · 0.9 mi · HGVs 1.4% | 16,521 |
| B3130 Barrow Street to A371 Locking Moor Road North Somerset · 13.7 mi · HGVs 2.7% | 14,897 |
| A3033 Devonshire Road to Carlton Street North Somerset · 1.5 mi · HGVs 0.3% | 12,000 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
City of Bristol to Somerset · 30.2 miles
A370 traffic and collisions by section
15 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 4 short link roads and spurs (0.8 miles) count in the road’s totals but are not listed.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A38 to A4City of Bristol | 8,981 | 20 |
| 2 | A3029/B3120 to A38 roundaboutCity of Bristol | 16,602 | 11 |
| 3 | A3029 Brunel Road to A370City of Bristol | 22,710 | 3 |
| 4 | A369 to A3029City of Bristol | 33,879 | 4 |
| 5 | A369/A3029 midpoint to B3130 Barrow StreetCity of Bristol, North Somerset | 40,208 | 13 |
| 6 | B3130 Barrow Street to A371 Locking Moor RoadNorth Somerset | 14,897 | 89 |
| 7 | A371 Locking Moor Road to M5 J 21North Somerset | 36,194 | 18 |
| 8 | A3033 Drove Road to A371North Somerset | 32,596 | 46 |
| 9 | A3033 to A370 Francis Fox RoadNorth Somerset | 21,396 | 7 |
| 10 | A370 Francis Fox Road to Walliscote RdNorth Somerset | 11,908 | 6 |
| 11 | A370 Beach Road to Walliscote RoadNorth Somerset | 5,855 | 4 |
| 12 | A3033 Devonshire Road to Carlton StreetNorth Somerset | 12,000 | 15 |
| 13 | A3033 to Bleadon HillNorth Somerset | 16,521 | 13 |
| 14 | Bleadon Hill to B3140North Somerset, Somerset | 17,050 | 12 |
| 15 | B3140 to A38Somerset | 15,304 | 6 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A370 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.
A370 traffic by vehicle type
Cars and taxis make up 80.2% of the vehicle miles on the A370. HGVs account for 2.4%, rising to 3.6% on A3029/B3120 to A38 roundabout.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 3.8% |
| 2001 | 3.6% |
| 2002 | 3.8% |
| 2003 | 3.5% |
| 2004 | 3.5% |
| 2005 | 3.5% |
| 2006 | 3.3% |
| 2007 | 3.3% |
| 2008 | 3.2% |
| 2009 | 2.8% |
| 2010 | 3.0% |
| 2011 | 3.1% |
| 2012 | 3.1% |
| 2013 | 3.0% |
| 2014 | 3.0% |
| 2015 | 3.0% |
| 2016 | 3.1% |
| 2017 | 2.9% |
| 2018 | 2.8% |
| 2019 | 2.9% |
| 2020 | 2.8% |
| 2021 | 2.7% |
| 2022 | 2.6% |
| 2023 | 2.4% |
| 2024 | 2.4% |
| 2025 | 2.4% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A370 traffic trend
Traffic on the A370 came to 208 million vehicle miles in 2025. At the count points present in both years, it is down 1.8% on 2019, before the pandemic, and up 3.4% on 2015.
Vehicle miles a year
Like for like, traffic is up 14.5% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 189m |
| 2001 | 197m |
| 2002 | 191m |
| 2003 | 202m |
| 2004 | 201m |
| 2005 | 202m |
| 2006 | 200m |
| 2007 | 200m |
| 2008 | 200m |
| 2009 | 204m |
| 2010 | 196m |
| 2011 | 194m |
| 2012 | 192m |
| 2013 | 193m |
| 2014 | 198m |
| 2015 | 202m |
| 2016 | 203m |
| 2017 | 201m |
| 2018 | 215m |
| 2019 | 213m |
| 2020 | 158m |
| 2021 | 176m |
| 2022 | 196m |
| 2023 | 201m |
| 2024 | 207m |
| 2025 | 208m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 17,509 |
| 2001 | 18,283 |
| 2002 | 17,767 |
| 2003 | 18,770 |
| 2004 | 18,691 |
| 2005 | 18,792 |
| 2006 | 18,594 |
| 2007 | 18,594 |
| 2008 | 18,569 |
| 2009 | 18,957 |
| 2010 | 18,158 |
| 2011 | 18,032 |
| 2012 | 17,895 |
| 2013 | 17,963 |
| 2014 | 18,474 |
| 2015 | 18,794 |
| 2016 | 18,995 |
| 2017 | 19,256 |
| 2018 | 19,858 |
| 2019 | 19,478 |
| 2020 | 14,442 |
| 2021 | 16,093 |
| 2022 | 17,862 |
| 2023 | 18,351 |
| 2024 | 18,738 |
| 2025 | 18,905 |
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 (54.0% of today’s road for 2019). In 2025, 5 of the 21 count points were counted; DfT estimated the rest from earlier counts and local trends.
A370 collisions
Police recorded 273 collisions with the A370 as the first road from 2021 to 2025, 91 of them fatal or serious, including 8 fatal. That is 27.6 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 1.8 a year for each mile of road.
Reported collisions by year
Up 19.1% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 29 | 18 |
| 2022 | 34 | 16 |
| 2023 | 39 | 20 |
| 2024 | 40 | 21 |
| 2025 | 40 | 16 |
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 |
|---|---|
| A3033 to Bleadon Hill North Somerset · 13 collisions | 49.7 |
| A3033 Devonshire Road to Carlton Street North Somerset · 15 collisions | 49.5 |
| A3033 Drove Road to A371 North Somerset · 46 collisions | 33.1 |
| A3029/B3120 to A38 roundabout City of Bristol · 11 collisions | 32.3 |
| B3130 Barrow Street to A371 Locking Moor Road North Somerset · 89 collisions | 25.1 |
| A369/A3029 midpoint to B3130 Barrow Street City of Bristol, North Somerset · 13 collisions | 20.4 |
| A371 Locking Moor Road to M5 J 21 North Somerset · 18 collisions | 13.3 |
| Bleadon Hill to B3140 North Somerset, Somerset · 12 collisions | 8.7 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 59 collisions were recorded at junctions where the A370 was the second road; they are not in the figures above. Fatal or serious uses DfT’s adjusted serious figures. 97.8% of the collisions could be placed on a section. How we count collisions
Council areas on the A370
In route order. Each is the highway authority DfT files the count points under.
- City of Bristol
- North Somerset
- 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 | 21 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 273 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.