A-road
A484 traffic and collisions
The A484 is an A-road of 57.2 miles, from Swansea to Ceredigion. This page covers its traffic at 17 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 145m vehicle miles
- Average daily traffic 6,933 vehicles a day, both directions
- Busiest section 24,438 A483 to A4240
- HGV share 2.6% of vehicle miles
- Traffic since 2019 −3.3% same count points
- Collisions, 2021 to 2025 183 26.5 per 100m vehicle miles
How busy is the A484?
On an average day in 2025, 6,933 vehicles passed each point on the A484, counting both directions. The busiest section is A483 to A4240 (Swansea), with 24,438 a day; the quietest listed is B4333 to A486, with 1,795.
Busiest sections, 2025
A483 to A4240 carries 3.5 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A483 to A4240 Swansea · 3.9 mi · HGVs 2.4% | 24,438 |
| A4138 to A476 Carmarthenshire · 1.2 mi · HGVs 0.9% | 20,279 |
| A4240 to A4138 Swansea, Carmarthenshire · 2.8 mi · HGVs 2.1% | 12,614 |
| A4242 to A4243 Carmarthenshire · 1.2 mi · HGVs 0.6% | 12,551 |
| A476 to Maesyrhaf, Pwll Carmarthenshire · 2.2 mi · HGVs 0.9% | 12,550 |
| B4309 to A48 Carmarthenshire · 2.2 mi · HGVs 2.6% | 11,666 |
| Maesyrhaf, Pwll to B4308 Monksford St Carmarthenshire · 6.8 mi · HGVs 2.8% | 5,358 |
| B4308 Monksford St to B4309 Carmarthenshire · 6.9 mi · HGVs 2.1% | 5,147 |
| A485 to B4333 Carmarthenshire · 6.3 mi · HGVs 5.3% | 4,237 |
| A475E to A487 Carmarthenshire, Ceredigion · 9.9 mi · HGVs 3.6% | 4,226 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Swansea to Ceredigion · 57.2 miles
A484 traffic and collisions by section
15 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 | A483 to A4240Swansea | 24,438 | 12 |
| 2 | A4240 to A4138Swansea, Carmarthenshire | 12,614 | 27 |
| 3 | A4138 to A476Carmarthenshire | 20,279 | 6 |
| 4 | A476 to A4124Carmarthenshire | 15,877 | 5 |
| 5 | A476 to Maesyrhaf, PwllCarmarthenshire | 12,550 | 27 |
| 6 | Maesyrhaf, Pwll to B4308 Monksford StCarmarthenshire | 5,358 | 20 |
| 7 | B4308 Monksford St to B4309Carmarthenshire | 5,147 | 22 |
| 8 | B4309 to A48Carmarthenshire | 11,666 | 7 |
| 9 | A40 to A4242Carmarthenshire | 16,271 | fewer than 3 |
| 10 | A4242 to A4243Carmarthenshire | 12,551 | 7 |
| 11 | A485 to B4333Carmarthenshire | 4,237 | 13 |
| 12 | B4333 to A486Carmarthenshire | 1,795 | 6 |
| 13 | A486 to A475WCarmarthenshire | 2,100 | 6 |
| 14 | A475W to A475ECarmarthenshire | 3,204 | fewer than 3 |
| 15 | A475E to A487Carmarthenshire, Ceredigion | 4,226 | 14 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A484 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.
A484 traffic by vehicle type
Cars and taxis make up 80.0% of the vehicle miles on the A484. HGVs account for 2.6%, rising to 5.3% on A485 to B4333.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 3.7% |
| 2001 | 3.3% |
| 2002 | 3.1% |
| 2003 | 3.1% |
| 2004 | 3.1% |
| 2005 | 3.2% |
| 2006 | 3.2% |
| 2007 | 3.1% |
| 2008 | 3.4% |
| 2009 | 3.3% |
| 2010 | 3.3% |
| 2011 | 3.2% |
| 2012 | 3.2% |
| 2013 | 2.8% |
| 2014 | 2.6% |
| 2015 | 2.6% |
| 2016 | 2.6% |
| 2017 | 2.6% |
| 2018 | 2.6% |
| 2019 | 2.6% |
| 2020 | 3.1% |
| 2021 | 2.9% |
| 2022 | 2.8% |
| 2023 | 2.7% |
| 2024 | 2.6% |
| 2025 | 2.6% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A484 traffic trend
Traffic on the A484 came to 145 million vehicle miles in 2025. At the count points present in both years, it is down 3.3% on 2019, before the pandemic, and up 1.0% on 2015.
Vehicle miles a year
Like for like, traffic is up 12.6% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 125m |
| 2001 | 124m |
| 2002 | 129m |
| 2003 | 136m |
| 2004 | 132m |
| 2005 | 134m |
| 2006 | 158m |
| 2007 | 159m |
| 2008 | 141m |
| 2009 | 140m |
| 2010 | 138m |
| 2011 | 138m |
| 2012 | 137m |
| 2013 | 137m |
| 2014 | 138m |
| 2015 | 141m |
| 2016 | 146m |
| 2017 | 148m |
| 2018 | 149m |
| 2019 | 150m |
| 2020 | 114m |
| 2021 | 127m |
| 2022 | 137m |
| 2023 | 141m |
| 2024 | 142m |
| 2025 | 145m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 6,098 |
| 2001 | 6,064 |
| 2002 | 6,314 |
| 2003 | 6,650 |
| 2004 | 6,450 |
| 2005 | 6,558 |
| 2006 | 7,706 |
| 2007 | 7,780 |
| 2008 | 6,907 |
| 2009 | 6,849 |
| 2010 | 6,755 |
| 2011 | 6,759 |
| 2012 | 6,682 |
| 2013 | 6,689 |
| 2014 | 6,751 |
| 2015 | 6,907 |
| 2016 | 7,147 |
| 2017 | 7,231 |
| 2018 | 7,222 |
| 2019 | 7,168 |
| 2020 | 5,431 |
| 2021 | 6,052 |
| 2022 | 6,524 |
| 2023 | 6,700 |
| 2024 | 6,780 |
| 2025 | 6,933 |
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 (89.0% of today’s road for 2019). In 2025, 3 of the 17 count points were counted; DfT estimated the rest from earlier counts and local trends.
A484 collisions
Police recorded 183 collisions with the A484 as the first road from 2021 to 2025, 63 of them fatal or serious. That is 26.5 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 0.6 a year for each mile of road.
Reported collisions by year
Down 10.9% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 31 | 15 |
| 2022 | 23 | 10 |
| 2023 | 22 | 13 |
| 2024 | 20 | 8 |
| 2025 | 24 | 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 |
|---|---|
| A485 to B4333 Carmarthenshire · 13 collisions | 133.4 |
| A476 to Maesyrhaf, Pwll Carmarthenshire · 27 collisions | 55.8 |
| A4240 to A4138 Swansea, Carmarthenshire · 27 collisions | 43.6 |
| B4308 Monksford St to B4309 Carmarthenshire · 22 collisions | 34.9 |
| Maesyrhaf, Pwll to B4308 Monksford St Carmarthenshire · 20 collisions | 31.3 |
| A475E to A487 Carmarthenshire, Ceredigion · 14 collisions | 19.1 |
| A483 to A4240 Swansea · 12 collisions | 7.4 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 20 collisions were recorded at junctions where the A484 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 A484
In route order. Each is the highway authority DfT files the count points under.
- Swansea
- Carmarthenshire
- Ceredigion
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 | 17 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 183 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.