A-road
A476 traffic and collisions
The A476 is an A-road of 18.2 miles, in Carmarthenshire. This page covers its traffic at 7 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 39m vehicle miles
- Average daily traffic 5,804 vehicles a day, both directions
- Busiest section 13,075 Ridgeway, Swiss Valley to A484 roundabout
- HGV share 2.3% of vehicle miles
- Traffic since 2019 −5.6% same count points
- Collisions, 2021 to 2025 60 32.6 per 100m vehicle miles
How busy is the A476?
On an average day in 2025, 5,804 vehicles passed each point on the A476, counting both directions. The busiest section is Ridgeway, Swiss Valley to A484 roundabout (Carmarthenshire), with 13,075 a day; the quietest listed is Junction A476/A483 (Near Ffairfach Station) to A476 Junction Near The Gate, Carmarthenshire, with 4,258.
Busiest sections, 2025
Ridgeway, Swiss Valley to A484 roundabout carries 2.3 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| Ridgeway, Swiss Valley to A484 roundabout Carmarthenshire · 1.8 mi · HGVs 1.1% | 13,075 |
| B4310 Heol-y-Bryn to A48 Carmarthenshire · 1.6 mi · HGVs 1.2% | 8,153 |
| C-road Ystradfai to Ridgeway, Swiss Valley Carmarthenshire · 0.6 mi · HGVs 2.4% | 5,809 |
| A476 Junction Near The Gate, Carmarthenshire to A48(T)/A476 Roundbaout Carmarthenshire · 1.3 mi · HGVs 1.6% | 5,528 |
| Llannon Road to B4310 Bethania Road Carmarthenshire · 5.5 mi · HGVs 2.1% | 4,948 |
| Junction A476/A483 (Near Ffairfach Station) to A476 Junction Near The Gate, Carmarthenshire Carmarthenshire · 6.3 mi · HGVs 3.9% | 4,258 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
In Carmarthenshire · 18.2 miles
A476 traffic and collisions by section
6 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 1 short link roads and spurs (1.1 miles) count in the road’s totals but are not listed.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | Junction A476/A483 (Near Ffairfach Station) to A476 Junction Near The Gate, CarmarthenshireCarmarthenshire | 4,258 | 11 |
| 2 | A476 Junction Near The Gate, Carmarthenshire to A48(T)/A476 RoundbaoutCarmarthenshire | 5,528 | 4 |
| 3 | B4310 Heol-y-Bryn to A48Carmarthenshire | 8,153 | 14 |
| 4 | Llannon Road to B4310 Bethania RoadCarmarthenshire | 4,948 | 16 |
| 5 | C-road Ystradfai to Ridgeway, Swiss ValleyCarmarthenshire | 5,809 | 0 |
| 6 | Ridgeway, Swiss Valley to A484 roundaboutCarmarthenshire | 13,075 | 13 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A476 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.
A476 traffic by vehicle type
Cars and taxis make up 80.1% of the vehicle miles on the A476. HGVs account for 2.3%, rising to 3.9% on Junction A476/A483 (Near Ffairfach Station) to A476 Junction Near The Gate, Carmarthenshire.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 2.8% |
| 2001 | 3.1% |
| 2002 | 3.0% |
| 2003 | 3.3% |
| 2004 | 4.0% |
| 2005 | 4.0% |
| 2006 | 2.3% |
| 2007 | 2.5% |
| 2008 | 2.4% |
| 2009 | 3.1% |
| 2010 | 3.1% |
| 2011 | 2.9% |
| 2012 | 2.5% |
| 2013 | 2.5% |
| 2014 | 2.5% |
| 2015 | 2.5% |
| 2016 | 2.4% |
| 2017 | 2.4% |
| 2018 | 2.5% |
| 2019 | 2.5% |
| 2020 | 2.9% |
| 2021 | 2.8% |
| 2022 | 2.7% |
| 2023 | 2.7% |
| 2024 | 2.3% |
| 2025 | 2.3% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A476 traffic trend
Traffic on the A476 came to 38.6 million vehicle miles in 2025. At the count points present in both years, it is down 5.6% on 2019, before the pandemic, and down 11.3% on 2015.
Vehicle miles a year
Like for like, traffic is up 24.5% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 31m |
| 2001 | 31m |
| 2002 | 33m |
| 2003 | 32m |
| 2004 | 31m |
| 2005 | 33m |
| 2006 | 54m |
| 2007 | 55m |
| 2008 | 56m |
| 2009 | 41m |
| 2010 | 40m |
| 2011 | 41m |
| 2012 | 40m |
| 2013 | 40m |
| 2014 | 41m |
| 2015 | 42m |
| 2016 | 42m |
| 2017 | 40m |
| 2018 | 40m |
| 2019 | 40m |
| 2020 | 30m |
| 2021 | 33m |
| 2022 | 36m |
| 2023 | 39m |
| 2024 | 38m |
| 2025 | 39m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 4,763 |
| 2001 | 4,778 |
| 2002 | 5,103 |
| 2003 | 5,009 |
| 2004 | 4,781 |
| 2005 | 5,108 |
| 2006 | 8,463 |
| 2007 | 8,537 |
| 2008 | 8,766 |
| 2009 | 6,341 |
| 2010 | 6,266 |
| 2011 | 6,313 |
| 2012 | 6,199 |
| 2013 | 6,219 |
| 2014 | 6,373 |
| 2015 | 6,476 |
| 2016 | 6,520 |
| 2017 | 6,227 |
| 2018 | 6,188 |
| 2019 | 6,217 |
| 2020 | 4,679 |
| 2021 | 5,154 |
| 2022 | 5,543 |
| 2023 | 5,850 |
| 2024 | 5,754 |
| 2025 | 5,804 |
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 (52.2% of today’s road for 2019). In 2025, 0 of the 7 count points were counted; DfT estimated the rest from earlier counts and local trends.
A476 collisions
Police recorded 60 collisions with the A476 as the first road from 2021 to 2025, fewer than 3 of them fatal or serious. That is 32.6 per 100 million vehicle miles, close to the 31.5 for all A-roads in Great Britain. On average there were 0.7 a year for each mile of road.
Reported collisions by year
Up 7.7% from 2021 to 2025.
| Year | Collisions |
|---|---|
| 2021 | 13 |
| 2022 | 11 |
| 2023 | 7 |
| 2024 | 15 |
| 2025 | 14 |
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 |
|---|---|
| B4310 Heol-y-Bryn to A48 Carmarthenshire · 14 collisions | 61.2 |
| Junction A476/A483 (Near Ffairfach Station) to A476 Junction Near The Gate, Carmarthenshire Carmarthenshire · 11 collisions | 39.4 |
| Llannon Road to B4310 Bethania Road Carmarthenshire · 16 collisions | 33.6 |
| Ridgeway, Swiss Valley to A484 roundabout Carmarthenshire · 13 collisions | 31.2 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 12 collisions were recorded at junctions where the A476 was the second road; they are not in the figures above. Fatal or serious uses DfT’s adjusted serious figures. 96.7% of the collisions could be placed on a section. How we count collisions
Council areas on the A476
In route order. Each is the highway authority DfT files the count points under.
- Carmarthenshire
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 | 7 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 60 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.