A-road
A4059 traffic and collisions
The A4059 is an A-road of 21.8 miles, from Rhondda Cynon Taf to Powys. This page covers its traffic at 5 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 108m vehicle miles
- Average daily traffic 13,553 vehicles a day, both directions
- Busiest section 23,841 A4233 to A465(T)
- HGV share 2.9% of vehicle miles
- Traffic since 2019 −12.0% same count points
- Collisions, 2021 to 2025 87 19.8 per 100m vehicle miles
How busy is the A4059?
On an average day in 2025, 13,553 vehicles passed each point on the A4059, counting both directions. The busiest section is A4233 to A465(T) (Rhondda Cynon Taf), with 23,841 a day; the quietest listed is C road (Penderyn) to A470, with 1,314.
Busiest sections, 2025
A4233 to A465(T) carries 1.8 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A4233 to A465(T) Rhondda Cynon Taf · 4.0 mi · HGVs 1.8% | 23,841 |
| A470 to A4275 Rhondda Cynon Taf · 8.0 mi · HGVs 2.5% | 22,550 |
| A465 to C-road west of Chapel Rd, Penderyn Rhondda Cynon Taf · 2.4 mi · HGVs 15.1% | 4,153 |
| C road (Penderyn) to A470 Rhondda Cynon Taf, Powys · 7.4 mi · HGVs 7.6% | 1,314 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Rhondda Cynon Taf to Powys · 21.8 miles
A4059 traffic and collisions by section
4 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 | A470 to A4275Rhondda Cynon Taf | 22,550 | 51 |
| 2 | A4233 to A465(T)Rhondda Cynon Taf | 23,841 | 17 |
| 3 | A465 to C-road west of Chapel Rd, PenderynRhondda Cynon Taf | 4,153 | 3 |
| 4 | C road (Penderyn) to A470Rhondda Cynon Taf, Powys | 1,314 | 16 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A4059 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.
A4059 traffic by vehicle type
Cars and taxis make up 78.0% of the vehicle miles on the A4059. HGVs account for 2.9%, rising to 15.1% on A465 to C-road west of Chapel Rd, Penderyn.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 4.9% |
| 2001 | 4.1% |
| 2002 | 4.0% |
| 2003 | 3.7% |
| 2004 | 4.0% |
| 2005 | 3.7% |
| 2006 | 3.6% |
| 2007 | 3.6% |
| 2008 | 3.5% |
| 2009 | 3.4% |
| 2010 | 3.3% |
| 2011 | 3.3% |
| 2012 | 3.3% |
| 2013 | 3.4% |
| 2014 | 3.5% |
| 2015 | 3.5% |
| 2016 | 3.4% |
| 2017 | 3.2% |
| 2018 | 3.1% |
| 2019 | 3.1% |
| 2020 | 3.7% |
| 2021 | 3.6% |
| 2022 | 3.3% |
| 2023 | 2.9% |
| 2024 | 2.8% |
| 2025 | 2.9% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A4059 traffic trend
Traffic on the A4059 came to 108 million vehicle miles in 2025. At the count points present in both years, it is down 12.0% on 2019, before the pandemic, and down 8.4% on 2015.
Vehicle miles a year
Like for like, traffic is up 39.8% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 72m |
| 2001 | 73m |
| 2002 | 76m |
| 2003 | 77m |
| 2004 | 77m |
| 2005 | 79m |
| 2006 | 83m |
| 2007 | 86m |
| 2008 | 85m |
| 2009 | 85m |
| 2010 | 83m |
| 2011 | 83m |
| 2012 | 84m |
| 2013 | 85m |
| 2014 | 84m |
| 2015 | 87m |
| 2016 | 82m |
| 2017 | 81m |
| 2018 | 81m |
| 2019 | 83m |
| 2020 | 62m |
| 2021 | 68m |
| 2022 | 76m |
| 2023 | 90m |
| 2024 | 98m |
| 2025 | 108m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 9,528 |
| 2001 | 9,768 |
| 2002 | 10,098 |
| 2003 | 10,257 |
| 2004 | 10,261 |
| 2005 | 10,476 |
| 2006 | 11,014 |
| 2007 | 11,493 |
| 2008 | 11,334 |
| 2009 | 11,272 |
| 2010 | 11,026 |
| 2011 | 11,069 |
| 2012 | 11,220 |
| 2013 | 11,257 |
| 2014 | 11,106 |
| 2015 | 11,566 |
| 2016 | 10,907 |
| 2017 | 10,789 |
| 2018 | 10,758 |
| 2019 | 10,863 |
| 2020 | 8,150 |
| 2021 | 8,982 |
| 2022 | 9,965 |
| 2023 | 11,827 |
| 2024 | 12,942 |
| 2025 | 13,553 |
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 (33.9% of today’s road for 2019). In 2025, 0 of the 5 count points were counted; DfT estimated the rest from earlier counts and local trends.
A4059 collisions
Police recorded 87 collisions with the A4059 as the first road from 2021 to 2025, fewer than 3 of them fatal or serious, including 5 fatal. That is 19.8 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 0.8 a year for each mile of road.
Reported collisions by year
About the same in 2025 as in 2021.
| Year | Collisions |
|---|---|
| 2021 | 17 |
| 2022 | 16 |
| 2023 | 27 |
| 2024 | 10 |
| 2025 | 17 |
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 |
|---|---|
| C road (Penderyn) to A470 Rhondda Cynon Taf, Powys · 16 collisions | 93.8 |
| A470 to A4275 Rhondda Cynon Taf · 51 collisions | 77.5 |
| A4233 to A465(T) Rhondda Cynon Taf · 17 collisions | 48.8 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 20 collisions were recorded at junctions where the A4059 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 A4059
In route order. Each is the highway authority DfT files the count points under.
- Rhondda Cynon Taf
- Powys
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 | 87 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.