A-road
A4050 traffic and collisions
The A4050 is an A-road of 6.1 miles, in The Vale of Glamorgan. This page covers its traffic at 5 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 50m vehicle miles
- Average daily traffic 22,271 vehicles a day, both directions
- Busiest section 28,139 Brooklands Terrace roundabout to A4050
- HGV share 2.3% of vehicle miles
- Traffic since 2019 −6.7% same count points
- Collisions, 2021 to 2025 26 11.4 per 100m vehicle miles
How busy is the A4050?
On an average day in 2025, 22,271 vehicles passed each point on the A4050, counting both directions. The busiest section is Brooklands Terrace roundabout to A4050 (The Vale of Glamorgan), with 28,139 a day; the quietest listed is Park Ave/Harbour Rd/St Nicholas Road triangle to A4226 Port Road West, with 15,510.
Busiest sections, 2025
Brooklands Terrace roundabout to A4050 carries 1.3 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| Brooklands Terrace roundabout to A4050 The Vale of Glamorgan · 2.6 mi · HGVs 3.1% | 28,139 |
| Merthyr Dyfan Rd to A4226 The Vale of Glamorgan · 0.7 mi · HGVs 1.8% | 20,492 |
| A4231 to Merthyr Dyfan Rd The Vale of Glamorgan · 0.7 mi · HGVs 1.8% | 18,046 |
| Park Ave/Harbour Rd/St Nicholas Road triangle to A4226 Port Road West The Vale of Glamorgan · 1.9 mi · HGVs 0.7% | 15,510 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
In The Vale of Glamorgan · 6.1 miles
A4050 traffic and collisions by section
5 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A48/A4232 to Brooklands Terrace roundaboutThe Vale of Glamorgan | 31,234 | 0 |
| 2 | Brooklands Terrace roundabout to A4050The Vale of Glamorgan | 28,139 | 12 |
| 3 | A4231 to Merthyr Dyfan RdThe Vale of Glamorgan | 18,046 | fewer than 3 |
| 4 | Merthyr Dyfan Rd to A4226The Vale of Glamorgan | 20,492 | fewer than 3 |
| 5 | Park Ave/Harbour Rd/St Nicholas Road triangle to A4226 Port Road WestThe Vale of Glamorgan | 15,510 | 11 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A4050 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.
A4050 traffic by vehicle type
Cars and taxis make up 82.3% of the vehicle miles on the A4050. HGVs account for 2.3%.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 4.2% |
| 2001 | 4.0% |
| 2002 | 4.0% |
| 2003 | 4.4% |
| 2004 | 4.3% |
| 2005 | 4.1% |
| 2006 | 5.0% |
| 2007 | 5.0% |
| 2008 | 5.2% |
| 2009 | 4.0% |
| 2010 | 3.3% |
| 2011 | 3.3% |
| 2012 | 2.8% |
| 2013 | 2.9% |
| 2014 | 3.0% |
| 2015 | 3.1% |
| 2016 | 3.0% |
| 2017 | 3.3% |
| 2018 | 3.3% |
| 2019 | 2.5% |
| 2020 | 3.0% |
| 2021 | 2.7% |
| 2022 | 2.5% |
| 2023 | 2.2% |
| 2024 | 2.1% |
| 2025 | 2.3% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A4050 traffic trend
Traffic on the A4050 came to 49.6 million vehicle miles in 2025. At the count points present in both years, it is down 6.7% on 2019, before the pandemic, and down 2.6% on 2015.
Vehicle miles a year
Like for like, traffic is down 5.6% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 50m |
| 2001 | 52m |
| 2002 | 53m |
| 2003 | 51m |
| 2004 | 53m |
| 2005 | 53m |
| 2006 | 49m |
| 2007 | 48m |
| 2008 | 47m |
| 2009 | 51m |
| 2010 | 49m |
| 2011 | 49m |
| 2012 | 48m |
| 2013 | 48m |
| 2014 | 48m |
| 2015 | 49m |
| 2016 | 51m |
| 2017 | 50m |
| 2018 | 50m |
| 2019 | 49m |
| 2020 | 38m |
| 2021 | 40m |
| 2022 | 44m |
| 2023 | 46m |
| 2024 | 47m |
| 2025 | 50m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 23,327 |
| 2001 | 24,032 |
| 2002 | 24,480 |
| 2003 | 23,478 |
| 2004 | 24,436 |
| 2005 | 24,587 |
| 2006 | 22,618 |
| 2007 | 22,199 |
| 2008 | 21,981 |
| 2009 | 23,872 |
| 2010 | 22,709 |
| 2011 | 22,675 |
| 2012 | 22,346 |
| 2013 | 22,299 |
| 2014 | 22,396 |
| 2015 | 22,957 |
| 2016 | 23,761 |
| 2017 | 23,358 |
| 2018 | 23,338 |
| 2019 | 22,892 |
| 2020 | 17,398 |
| 2021 | 18,775 |
| 2022 | 20,468 |
| 2023 | 21,556 |
| 2024 | 21,844 |
| 2025 | 22,271 |
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 (57.4% of today’s road for 2019). In 2025, 1 of the 5 count points were counted; DfT estimated the rest from earlier counts and local trends.
A4050 collisions
Police recorded 26 collisions with the A4050 as the first road from 2021 to 2025, 9 of them fatal or serious. That is 11.4 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
| Year | Collisions |
|---|---|
| 2021 | 0 |
| 2022 | 6 |
| 2023 | 9 |
| 2024 | 4 |
| 2025 | 7 |
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 |
|---|---|
| Brooklands Terrace roundabout to A4050 The Vale of Glamorgan · 12 collisions | 44.9 |
| Park Ave/Harbour Rd/St Nicholas Road triangle to A4226 Port Road West The Vale of Glamorgan · 11 collisions | 21.3 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 5 collisions were recorded at junctions where the A4050 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 A4050
In route order. Each is the highway authority DfT files the count points under.
- The Vale of Glamorgan
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 | 5 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 26 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.