Trunk A-road
A4232 traffic and collisions
The A4232 is a trunk A-road of 13.1 miles, in Cardiff. This page covers its traffic at 13 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 244m vehicle miles
- Average daily traffic 51,023 vehicles a day, both directions
- Busiest section 60,908 A4055 to B4267
- HGV share 3.8% of vehicle miles
- Traffic since 2019 −8.9% same count points
- Collisions, 2021 to 2025 90 7.7 per 100m vehicle miles
How busy is the A4232?
On an average day in 2025, 51,023 vehicles passed each point on the A4232, counting both directions. The busiest section is A4055 to B4267 (Cardiff, The Vale of Glamorgan), with 60,908 a day; the quietest listed is Ocean Way - Rover Way roundabout to A4234, with 19,956.
Busiest sections, 2025
A4055 to B4267 carries 1.2 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A4055 to B4267 Cardiff, The Vale of Glamorgan · 1.9 mi · HGVs 3.4% | 60,908 |
| B4267 mid-junction to A48/A4050 Cardiff · 2.9 mi · HGVs 3.4% | 60,908 |
| A48 / A4050 to M4 Junction 33 Cardiff · 3.6 mi · HGVs 4.5% | 60,565 |
| A470 to A4055 Cardiff · 1.2 mi · HGVs 3.1% | 47,046 |
| A4234 to A470 Cardiff · 0.6 mi · HGVs 3.0% | 44,924 |
| Count point 92140 Cardiff · 0.9 mi · HGVs 5.2% | 28,353 |
| M4 Junction 30 to A48 Cardiff · 0.7 mi · HGVs 3.1% | 27,521 |
| A48 to road to Llanedeyrn Cardiff · 0.6 mi · HGVs 3.1% | 26,421 |
| Ocean Way - Rover Way roundabout to A4234 Cardiff · 0.7 mi · HGVs 5.5% | 19,956 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
In Cardiff · 13.1 miles
A4232 traffic and collisions by section
9 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 | M4 Junction 30 to A48Cardiff | 27,521 | 6 |
| 2 | A48 to road to LlanedeyrnCardiff | 26,421 | 5 |
| 3 | Count point 92140Cardiff | 28,353 | 17 |
| 4 | Ocean Way - Rover Way roundabout to A4234Cardiff | 19,956 | 3 |
| 5 | A4234 to A470Cardiff | 44,924 | 5 |
| 6 | A470 to A4055Cardiff | 47,046 | 8 |
| 7 | A4055 to B4267Cardiff, The Vale of Glamorgan | 60,908 | 6 |
| 8 | B4267 mid-junction to A48/A4050Cardiff | 60,908 | 16 |
| 9 | A48 / A4050 to M4 Junction 33Cardiff | 60,565 | 24 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A4232 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.
A4232 traffic by vehicle type
Cars and taxis make up 79.6% of the vehicle miles on the A4232. HGVs account for 3.8%, rising to 5.5% on Ocean Way - Rover Way roundabout to A4234.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 5.4% |
| 2001 | 4.9% |
| 2002 | 4.9% |
| 2003 | 5.3% |
| 2004 | 4.7% |
| 2005 | 5.4% |
| 2006 | 4.5% |
| 2007 | 5.0% |
| 2008 | 4.9% |
| 2009 | 4.0% |
| 2010 | 4.0% |
| 2011 | 4.4% |
| 2012 | 4.0% |
| 2013 | 4.2% |
| 2014 | 4.0% |
| 2015 | 3.9% |
| 2016 | 3.8% |
| 2017 | 4.0% |
| 2018 | 3.9% |
| 2019 | 3.9% |
| 2020 | 5.0% |
| 2021 | 4.4% |
| 2022 | 4.2% |
| 2023 | 3.9% |
| 2024 | 3.9% |
| 2025 | 3.8% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A4232 traffic trend
Traffic on the A4232 came to 244 million vehicle miles in 2025. At the count points present in both years, it is down 8.9% on 2019, before the pandemic, and up 3.2% on 2015.
Vehicle miles a year
Like for like, traffic is up 57.2% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 171m |
| 2001 | 184m |
| 2002 | 182m |
| 2003 | 195m |
| 2004 | 208m |
| 2005 | 186m |
| 2006 | 208m |
| 2007 | 202m |
| 2008 | 194m |
| 2009 | 198m |
| 2010 | 187m |
| 2011 | 202m |
| 2012 | 206m |
| 2013 | 205m |
| 2014 | 213m |
| 2015 | 223m |
| 2016 | 238m |
| 2017 | 232m |
| 2018 | 251m |
| 2019 | 266m |
| 2020 | 189m |
| 2021 | 212m |
| 2022 | 234m |
| 2023 | 245m |
| 2024 | 234m |
| 2025 | 244m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 39,769 |
| 2001 | 42,598 |
| 2002 | 42,217 |
| 2003 | 45,224 |
| 2004 | 48,254 |
| 2005 | 43,242 |
| 2006 | 48,225 |
| 2007 | 46,794 |
| 2008 | 44,980 |
| 2009 | 45,949 |
| 2010 | 43,425 |
| 2011 | 46,785 |
| 2012 | 47,730 |
| 2013 | 47,622 |
| 2014 | 49,356 |
| 2015 | 51,792 |
| 2016 | 53,469 |
| 2017 | 51,985 |
| 2018 | 52,391 |
| 2019 | 55,707 |
| 2020 | 39,572 |
| 2021 | 44,226 |
| 2022 | 48,910 |
| 2023 | 51,282 |
| 2024 | 48,865 |
| 2025 | 51,023 |
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, 6 of the 13 count points were counted; DfT estimated the rest from earlier counts and local trends.
A4232 collisions
Police recorded 90 collisions with the A4232 as the first road from 2021 to 2025, fewer than 3 of them fatal or serious. That is 7.7 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 1.4 a year for each mile of road.
Reported collisions by year
Up 108.3% from 2021 to 2025.
| Year | Collisions |
|---|---|
| 2021 | 12 |
| 2022 | 20 |
| 2023 | 15 |
| 2024 | 18 |
| 2025 | 25 |
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 |
|---|---|
| Count point 92140 Cardiff · 17 collisions | 36.9 |
| A48 / A4050 to M4 Junction 33 Cardiff · 24 collisions | 6.1 |
| B4267 mid-junction to A48/A4050 Cardiff · 16 collisions | 5.3 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 18 collisions were recorded at junctions where the A4232 was the second road; they are not in the figures above. Fatal or serious uses DfT’s adjusted serious figures. 100.0% of the collisions could be placed on a section. How we count collisions
Council areas on the A4232
In route order. Each is the highway authority DfT files the count points under.
- Cardiff
- 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 | 13 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 90 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.