A-road
A4058 traffic and collisions
The A4058 is an A-road of 11.3 miles, in Rhondda Cynon Taf. This page covers its traffic at 10 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 78m vehicle miles
- Average daily traffic 18,818 vehicles a day, both directions
- Busiest section 24,823 Tymawr Rd to B4278
- HGV share 1.4% of vehicle miles
- Traffic since 2019 +7.8% same count points
- Collisions, 2021 to 2025 76 21.8 per 100m vehicle miles
How busy is the A4058?
On an average day in 2025, 18,818 vehicles passed each point on the A4058, counting both directions. The busiest section is Tymawr Rd to B4278 (Rhondda Cynon Taf), with 24,823 a day; the quietest listed is A4233 to A4119, with 14,192.
Busiest sections, 2025
Tymawr Rd to B4278 carries 1.3 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| Tymawr Rd to B4278 Rhondda Cynon Taf · 1.7 mi · HGVs 1.5% | 24,823 |
| A4119 to B4278 Rhondda Cynon Taf · 0.9 mi · HGVs 1.0% | 21,552 |
| A4233 Gelliwastad Rd to Tymawr Rd Rhondda Cynon Taf · 1.5 mi · HGVs 1.8% | 21,216 |
| A4061 to A4119 Rhondda Cynon Taf · 3.2 mi · HGVs 1.1% | 14,320 |
| A4233 to A4119 Rhondda Cynon Taf · 2.2 mi · HGVs 1.6% | 14,192 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
In Rhondda Cynon Taf · 11.3 miles
A4058 traffic and collisions by section
10 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 | A4058 to A4054/A4223Rhondda Cynon Taf | 19,594 | fewer than 3 |
| 2 | A470 to A473Rhondda Cynon Taf | 22,030 | 0 |
| 3 | A473 to A4223Rhondda Cynon Taf | 26,896 | 9 |
| 4 | A4233 Gelliwastad Rd to Tymawr RdRhondda Cynon Taf | 21,216 | 12 |
| 5 | Tymawr Rd to B4278Rhondda Cynon Taf | 24,823 | 11 |
| 6 | B4278 to A4233Rhondda Cynon Taf | 24,823 | fewer than 3 |
| 7 | At A4233Rhondda Cynon Taf | 23,128 | 4 |
| 8 | A4233 to A4119Rhondda Cynon Taf | 14,192 | 10 |
| 9 | A4119 to B4278Rhondda Cynon Taf | 21,552 | 10 |
| 10 | A4061 to A4119Rhondda Cynon Taf | 14,320 | 17 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A4058 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.
A4058 traffic by vehicle type
Cars and taxis make up 80.8% of the vehicle miles on the A4058. HGVs account for 1.4%.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 3.6% |
| 2001 | 3.1% |
| 2002 | 2.4% |
| 2003 | 2.4% |
| 2004 | 2.6% |
| 2005 | 2.6% |
| 2006 | 2.6% |
| 2007 | 2.2% |
| 2008 | 2.1% |
| 2009 | 1.9% |
| 2010 | 1.9% |
| 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 | 1.9% |
| 2022 | 1.8% |
| 2023 | 1.5% |
| 2024 | 1.4% |
| 2025 | 1.4% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A4058 traffic trend
Traffic on the A4058 came to 77.6 million vehicle miles in 2025. At the count points present in both years, it is up 7.8% on 2019, before the pandemic, and up 7.3% on 2015.
Vehicle miles a year
Like for like, traffic is up 10.6% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 51m |
| 2001 | 51m |
| 2002 | 53m |
| 2003 | 53m |
| 2004 | 54m |
| 2005 | 53m |
| 2006 | 53m |
| 2007 | 54m |
| 2008 | 69m |
| 2009 | 68m |
| 2010 | 68m |
| 2011 | 68m |
| 2012 | 67m |
| 2013 | 66m |
| 2014 | 68m |
| 2015 | 66m |
| 2016 | 71m |
| 2017 | 72m |
| 2018 | 74m |
| 2019 | 70m |
| 2020 | 54m |
| 2021 | 60m |
| 2022 | 65m |
| 2023 | 72m |
| 2024 | 73m |
| 2025 | 78m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 14,391 |
| 2001 | 14,325 |
| 2002 | 14,944 |
| 2003 | 14,883 |
| 2004 | 15,236 |
| 2005 | 14,885 |
| 2006 | 14,988 |
| 2007 | 15,332 |
| 2008 | 18,229 |
| 2009 | 18,181 |
| 2010 | 18,018 |
| 2011 | 18,054 |
| 2012 | 17,935 |
| 2013 | 17,553 |
| 2014 | 17,990 |
| 2015 | 17,671 |
| 2016 | 18,851 |
| 2017 | 18,647 |
| 2018 | 18,825 |
| 2019 | 17,682 |
| 2020 | 13,630 |
| 2021 | 15,305 |
| 2022 | 16,429 |
| 2023 | 18,327 |
| 2024 | 18,594 |
| 2025 | 18,818 |
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 (83.2% of today’s road for 2019). In 2025, 0 of the 10 count points were counted; DfT estimated the rest from earlier counts and local trends.
A4058 collisions
Police recorded 76 collisions with the A4058 as the first road from 2021 to 2025, 15 of them fatal or serious. That is 21.8 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
Down 25.0% from 2021 to 2025.
| Year | Collisions |
|---|---|
| 2021 | 16 |
| 2022 | 21 |
| 2023 | 13 |
| 2024 | 14 |
| 2025 | 12 |
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 |
|---|---|
| A4233 Gelliwastad Rd to Tymawr Rd Rhondda Cynon Taf · 12 collisions | 103.3 |
| A4119 to B4278 Rhondda Cynon Taf · 10 collisions | 29.2 |
| A4061 to A4119 Rhondda Cynon Taf · 17 collisions | 22.5 |
| A4233 to A4119 Rhondda Cynon Taf · 10 collisions | 18.1 |
| Tymawr Rd to B4278 Rhondda Cynon Taf · 11 collisions | 16.0 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 8 collisions were recorded at junctions where the A4058 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 A4058
In route order. Each is the highway authority DfT files the count points under.
- Rhondda Cynon Taf
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 | 10 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 76 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.