A-road
A4119 traffic and collisions
The A4119 is an A-road of 21.2 miles, from Cardiff to Rhondda Cynon Taf. This page covers its traffic at 16 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 141m vehicle miles
- Average daily traffic 18,232 vehicles a day, both directions
- Busiest section 39,939 A4119 to A473
- HGV share 2.1% of vehicle miles
- Traffic since 2019 −2.4% same count points
- Collisions, 2021 to 2025 97 15.0 per 100m vehicle miles
How busy is the A4119?
On an average day in 2025, 18,232 vehicles passed each point on the A4119, counting both directions. The busiest section is A4119 to A473 (Rhondda Cynon Taf), with 39,939 a day; the quietest listed is A4232 to A4160, with 6,363.
Busiest sections, 2025
A4119 to A473 carries 2.2 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A4119 to A473 Rhondda Cynon Taf · 1.0 mi · HGVs 3.2% | 39,939 |
| A473 to B4595 Talbot Rd Rhondda Cynon Taf · 0.6 mi · HGVs 2.2% | 30,538 |
| B4595 Talbot Rd to A4093 Rhondda Cynon Taf · 4.3 mi · HGVs 2.2% | 27,512 |
| A4161 to A48 Cardiff · 1.4 mi · HGVs 0.5% | 22,417 |
| A4093 to A4233 Rhondda Cynon Taf · 0.7 mi · HGVs 1.5% | 21,998 |
| B4278 to A4058 Partridge Rd Rhondda Cynon Taf · 1.9 mi · HGVs 1.5% | 13,984 |
| A4054 to B4262 Heol Isaf Cardiff · 1.3 mi · HGVs 1.4% | 13,647 |
| A4233 to B4278 Rhondda Cynon Taf · 1.6 mi · HGVs 1.7% | 12,047 |
| B4262 Heol Isaf to A4119 Cardiff, Rhondda Cynon Taf · 5.2 mi · HGVs 2.0% | 8,686 |
| A4160 to Tudor Street Cardiff · 0.5 mi · HGVs 1.0% | 7,112 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Cardiff to Rhondda Cynon Taf · 21.2 miles
A4119 traffic and collisions by section
13 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 2 short link roads and spurs (0.9 miles) count in the road’s totals but are not listed.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A4232 to A4160Cardiff | 6,363 | 17 |
| 2 | A4160 to Tudor StreetCardiff | 7,112 | 9 |
| 3 | Tudor St to A4161 Cowbridge Road EastCardiff | 12,813 | 4 |
| 4 | A4161 to A48Cardiff | 22,417 | 9 |
| 5 | A48 to A4054Cardiff | 19,275 | 5 |
| 6 | A4054 to B4262 Heol IsafCardiff | 13,647 | 5 |
| 7 | B4262 Heol Isaf to A4119Cardiff, Rhondda Cynon Taf | 8,686 | 12 |
| 8 | A4119 to A473Rhondda Cynon Taf | 39,939 | 4 |
| 9 | A473 to B4595 Talbot RdRhondda Cynon Taf | 30,538 | 0 |
| 10 | B4595 Talbot Rd to A4093Rhondda Cynon Taf | 27,512 | 15 |
| 11 | A4093 to A4233Rhondda Cynon Taf | 21,998 | 3 |
| 12 | A4233 to B4278Rhondda Cynon Taf | 12,047 | fewer than 3 |
| 13 | B4278 to A4058 Partridge RdRhondda Cynon Taf | 13,984 | 7 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A4119 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.
A4119 traffic by vehicle type
Cars and taxis make up 84.2% of the vehicle miles on the A4119. HGVs account for 2.1%, rising to 3.2% on A4119 to A473.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 3.2% |
| 2001 | 3.2% |
| 2002 | 3.0% |
| 2003 | 2.8% |
| 2004 | 2.7% |
| 2005 | 2.5% |
| 2006 | 2.6% |
| 2007 | 2.6% |
| 2008 | 2.5% |
| 2009 | 2.3% |
| 2010 | 2.0% |
| 2011 | 1.9% |
| 2012 | 1.9% |
| 2013 | 1.9% |
| 2014 | 1.9% |
| 2015 | 1.8% |
| 2016 | 1.8% |
| 2017 | 1.8% |
| 2018 | 1.7% |
| 2019 | 1.7% |
| 2020 | 2.0% |
| 2021 | 2.0% |
| 2022 | 2.0% |
| 2023 | 2.0% |
| 2024 | 2.0% |
| 2025 | 2.1% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A4119 traffic trend
Traffic on the A4119 came to 141 million vehicle miles in 2025. At the count points present in both years, it is down 2.4% on 2019, before the pandemic, and down 1.5% on 2015.
Vehicle miles a year
Like for like, traffic is up 2.7% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 126m |
| 2001 | 128m |
| 2002 | 134m |
| 2003 | 137m |
| 2004 | 143m |
| 2005 | 141m |
| 2006 | 142m |
| 2007 | 146m |
| 2008 | 136m |
| 2009 | 136m |
| 2010 | 131m |
| 2011 | 132m |
| 2012 | 125m |
| 2013 | 124m |
| 2014 | 128m |
| 2015 | 130m |
| 2016 | 128m |
| 2017 | 127m |
| 2018 | 140m |
| 2019 | 141m |
| 2020 | 106m |
| 2021 | 118m |
| 2022 | 127m |
| 2023 | 130m |
| 2024 | 132m |
| 2025 | 141m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 16,393 |
| 2001 | 16,664 |
| 2002 | 17,356 |
| 2003 | 17,800 |
| 2004 | 18,615 |
| 2005 | 18,260 |
| 2006 | 18,398 |
| 2007 | 18,951 |
| 2008 | 18,385 |
| 2009 | 18,307 |
| 2010 | 17,675 |
| 2011 | 17,756 |
| 2012 | 16,836 |
| 2013 | 16,686 |
| 2014 | 17,263 |
| 2015 | 17,576 |
| 2016 | 17,220 |
| 2017 | 17,135 |
| 2018 | 18,380 |
| 2019 | 18,601 |
| 2020 | 14,013 |
| 2021 | 15,495 |
| 2022 | 16,760 |
| 2023 | 17,138 |
| 2024 | 17,430 |
| 2025 | 18,232 |
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 (60.4% of today’s road for 2019). In 2025, 4 of the 16 count points were counted; DfT estimated the rest from earlier counts and local trends.
A4119 collisions
Police recorded 97 collisions with the A4119 as the first road from 2021 to 2025, 20 of them fatal or serious. That is 15.0 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 35.3% from 2021 to 2025.
| Year | Collisions |
|---|---|
| 2021 | 17 |
| 2022 | 18 |
| 2023 | 21 |
| 2024 | 18 |
| 2025 | 23 |
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 |
|---|---|
| A4232 to A4160 Cardiff · 17 collisions | 137.3 |
| B4262 Heol Isaf to A4119 Cardiff, Rhondda Cynon Taf · 12 collisions | 40.6 |
| B4595 Talbot Rd to A4093 Rhondda Cynon Taf · 15 collisions | 34.7 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 11 collisions were recorded at junctions where the A4119 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 A4119
In route order. Each is the highway authority DfT files the count points under.
- Cardiff
- Rhondda Cynon Taf
- 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 | 16 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 97 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.