A-road
A4222 traffic and collisions
The A4222 is an A-road of 7.7 miles, from Rhondda Cynon Taf to 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 18m vehicle miles
- Average daily traffic 6,284 vehicles a day, both directions
- Busiest section 11,018 A473 to Llanharry Rd
- HGV share 2.0% of vehicle miles
- Traffic since 2019 −4.6% same count points
- Collisions, 2021 to 2025 10 4 fatal or serious
How busy is the A4222?
On an average day in 2025, 6,284 vehicles passed each point on the A4222, counting both directions. The busiest section is A473 to Llanharry Rd (Rhondda Cynon Taf), with 11,018 a day; the quietest listed is Llanharry Rd to A4222 Eastgate/Cardiff Rd, with 4,457.
Busiest sections, 2025
A473 to Llanharry Rd carries 1.8 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A473 to Llanharry Rd Rhondda Cynon Taf · 1.3 mi · HGVs 2.3% | 11,018 |
| A48 to A4222 Aberthin Rd The Vale of Glamorgan · 0.9 mi · HGVs 2.1% | 5,526 |
| Llanharry Rd to A4222 Eastgate/Cardiff Rd Rhondda Cynon Taf, The Vale of Glamorgan · 4.6 mi · HGVs 1.8% | 4,457 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Rhondda Cynon Taf to The Vale of Glamorgan · 7.7 miles
A4222 traffic and collisions by section
3 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 1 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 | A473 to Llanharry RdRhondda Cynon Taf | 11,018 | 4 |
| 2 | Llanharry Rd to A4222 Eastgate/Cardiff RdRhondda Cynon Taf, The Vale of Glamorgan | 4,457 | 4 |
| 3 | A48 to A4222 Aberthin RdThe Vale of Glamorgan | 5,526 | fewer than 3 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A4222 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.
A4222 traffic by vehicle type
Cars and taxis make up 81.2% of the vehicle miles on the A4222. HGVs account for 2.0%.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 2.0% |
| 2001 | 2.7% |
| 2002 | 2.4% |
| 2003 | 2.3% |
| 2004 | 2.6% |
| 2005 | 2.6% |
| 2006 | 2.6% |
| 2007 | 2.7% |
| 2008 | 2.8% |
| 2009 | 2.6% |
| 2010 | 2.7% |
| 2011 | 2.9% |
| 2012 | 2.4% |
| 2013 | 2.5% |
| 2014 | 2.0% |
| 2015 | 2.0% |
| 2016 | 1.9% |
| 2017 | 1.9% |
| 2018 | 1.9% |
| 2019 | 1.9% |
| 2020 | 2.2% |
| 2021 | 2.2% |
| 2022 | 2.1% |
| 2023 | 2.0% |
| 2024 | 2.0% |
| 2025 | 2.0% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A4222 traffic trend
Traffic on the A4222 came to 17.7 million vehicle miles in 2025. At the count points present in both years, it is down 4.6% on 2019, before the pandemic, and down 0.9% on 2015.
Vehicle miles a year
Like for like, traffic is down 14.2% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 21m |
| 2001 | 17m |
| 2002 | 17m |
| 2003 | 17m |
| 2004 | 19m |
| 2005 | 18m |
| 2006 | 19m |
| 2007 | 18m |
| 2008 | 17m |
| 2009 | 17m |
| 2010 | 17m |
| 2011 | 17m |
| 2012 | 17m |
| 2013 | 17m |
| 2014 | 18m |
| 2015 | 18m |
| 2016 | 18m |
| 2017 | 18m |
| 2018 | 18m |
| 2019 | 19m |
| 2020 | 14m |
| 2021 | 16m |
| 2022 | 17m |
| 2023 | 17m |
| 2024 | 18m |
| 2025 | 18m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 7,328 |
| 2001 | 6,030 |
| 2002 | 6,069 |
| 2003 | 6,115 |
| 2004 | 6,670 |
| 2005 | 6,494 |
| 2006 | 6,595 |
| 2007 | 6,239 |
| 2008 | 6,064 |
| 2009 | 6,129 |
| 2010 | 6,070 |
| 2011 | 5,941 |
| 2012 | 5,908 |
| 2013 | 5,868 |
| 2014 | 6,306 |
| 2015 | 6,339 |
| 2016 | 6,448 |
| 2017 | 6,464 |
| 2018 | 6,561 |
| 2019 | 6,588 |
| 2020 | 5,082 |
| 2021 | 5,592 |
| 2022 | 6,018 |
| 2023 | 6,142 |
| 2024 | 6,224 |
| 2025 | 6,284 |
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, 0 of the 5 count points were counted; DfT estimated the rest from earlier counts and local trends.
A4222 collisions
Police recorded 10 collisions with the A4222 as the first road from 2021 to 2025, 4 of them fatal or serious.
Reported collisions by year
| Year | Collisions | Fatal or serious |
|---|---|---|
| 2021 | fewer than 3 | 0 |
| 2022 | fewer than 3 | 0 |
| 2023 | 3 | fewer than 3 |
| 2024 | 0 | 0 |
| 2025 | 3 | fewer than 3 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
Fatal or serious uses DfT’s adjusted serious figures. How we count collisions
Council areas on the A4222
In route order. Each is the highway authority DfT files the count points under.
- 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 | 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 | 10 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.