Trunk A-road
A466 traffic and collisions
The A466 is a trunk A-road of 30.6 miles in Wales and England, from Monmouthshire to Herefordshire. This page covers its traffic at 11 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 47m vehicle miles
- Average daily traffic 4,180 vehicles a day, both directions
- Busiest section 23,968 A 48T to M48 Junction 2
- HGV share 2.3% of vehicle miles
- Traffic since 2019 −1.8% same count points
- Collisions, 2021 to 2025 48 21.6 per 100m vehicle miles
How busy is the A466?
On an average day in 2025, 4,180 vehicles passed each point on the A466, counting both directions. The busiest section is A 48T to M48 Junction 2 (Monmouthshire), with 23,968 a day; the quietest listed is A466 Dixton Rd/Monk St to B4348, with 1,782.
Busiest sections, 2025
A 48T to M48 Junction 2 carries 5.7 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A 48T to M48 Junction 2 Monmouthshire · 1.4 mi · HGVs 3.8% | 23,968 |
| A48 to B4293 Monmouthshire · 0.9 mi · HGVs 1.2% | 12,254 |
| Redbrook to A4136 Monmouthshire · 2.2 mi · HGVs 1.5% | 4,072 |
| B4293 to Bigsweir Monmouthshire · 8.9 mi · HGVs 1.8% | 3,693 |
| Bigsweir to Redbrook Gloucestershire · 3.7 mi · HGVs 0.6% | 3,666 |
| B4348 to A49(T) Herefordshire · 1.6 mi · HGVs 2.4% | 2,322 |
| A466 Dixton Rd/Monk St to B4348 Monmouthshire, Herefordshire · 11.0 mi · HGVs 2.5% | 1,782 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Monmouthshire to Herefordshire · 30.6 miles
A466 traffic and collisions by section
9 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 1 short link roads and spurs (0.6 miles) count in the road’s totals but are not listed.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A 48T to M48 Junction 2Monmouthshire | 23,968 | 16 |
| 2 | A48 to B4293Monmouthshire | 12,254 | 6 |
| 3 | B4293 to BigsweirMonmouthshire | 3,693 | 14 |
| 4 | Bigsweir to RedbrookGloucestershire | 3,666 | 3 |
| 5 | Redbrook to A4136Monmouthshire | 4,072 | fewer than 3 |
| 6 | A4136 to A40Monmouthshire | 11,956 | fewer than 3 |
| 7 | A40 to A466 splitMonmouthshire | 3,442 | fewer than 3 |
| 8 | A466 Dixton Rd/Monk St to B4348Monmouthshire, Herefordshire | 1,782 | 4 |
| 9 | B4348 to A49(T)Herefordshire | 2,322 | 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 A466 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.
A466 traffic by vehicle type
Cars and taxis make up 78.5% of the vehicle miles on the A466. HGVs account for 2.3%, rising to 3.8% on A 48T to M48 Junction 2.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 3.7% |
| 2001 | 3.6% |
| 2002 | 3.6% |
| 2003 | 3.1% |
| 2004 | 3.2% |
| 2005 | 3.0% |
| 2006 | 3.0% |
| 2007 | 3.1% |
| 2008 | 3.1% |
| 2009 | 2.7% |
| 2010 | 2.7% |
| 2011 | 2.7% |
| 2012 | 2.5% |
| 2013 | 2.4% |
| 2014 | 2.3% |
| 2015 | 2.1% |
| 2016 | 2.2% |
| 2017 | 2.0% |
| 2018 | 2.1% |
| 2019 | 2.0% |
| 2020 | 2.6% |
| 2021 | 2.7% |
| 2022 | 2.6% |
| 2023 | 2.3% |
| 2024 | 2.3% |
| 2025 | 2.3% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A466 traffic trend
Traffic on the A466 came to 46.7 million vehicle miles in 2025. At the count points present in both years, it is down 1.8% on 2019, before the pandemic, and down 4.8% on 2015.
Vehicle miles a year
Like for like, traffic is down 9.8% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 47m |
| 2001 | 45m |
| 2002 | 46m |
| 2003 | 49m |
| 2004 | 51m |
| 2005 | 50m |
| 2006 | 50m |
| 2007 | 50m |
| 2008 | 49m |
| 2009 | 50m |
| 2010 | 49m |
| 2011 | 49m |
| 2012 | 46m |
| 2013 | 47m |
| 2014 | 46m |
| 2015 | 44m |
| 2016 | 45m |
| 2017 | 46m |
| 2018 | 47m |
| 2019 | 48m |
| 2020 | 35m |
| 2021 | 41m |
| 2022 | 44m |
| 2023 | 46m |
| 2024 | 46m |
| 2025 | 47m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 4,243 |
| 2001 | 4,092 |
| 2002 | 4,118 |
| 2003 | 4,379 |
| 2004 | 4,622 |
| 2005 | 4,457 |
| 2006 | 4,515 |
| 2007 | 4,495 |
| 2008 | 4,440 |
| 2009 | 4,481 |
| 2010 | 4,372 |
| 2011 | 4,376 |
| 2012 | 4,177 |
| 2013 | 4,221 |
| 2014 | 4,159 |
| 2015 | 3,992 |
| 2016 | 4,074 |
| 2017 | 4,120 |
| 2018 | 4,207 |
| 2019 | 4,258 |
| 2020 | 3,153 |
| 2021 | 3,628 |
| 2022 | 3,912 |
| 2023 | 4,087 |
| 2024 | 4,138 |
| 2025 | 4,180 |
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, 1 of the 11 count points were counted; DfT estimated the rest from earlier counts and local trends.
A466 collisions
Police recorded 48 collisions with the A466 as the first road from 2021 to 2025, 21 of them fatal or serious. That is 21.6 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 0.3 a year for each mile of road.
Reported collisions by year
About the same in 2025 as in 2021.
| Year | Collisions |
|---|---|
| 2021 | 10 |
| 2022 | 12 |
| 2023 | 4 |
| 2024 | 12 |
| 2025 | 10 |
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 |
|---|---|
| A 48T to M48 Junction 2 Monmouthshire · 16 collisions | 27.2 |
| B4293 to Bigsweir Monmouthshire · 14 collisions | 24.3 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 12 collisions were recorded at junctions where the A466 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 A466
In route order. Each is the highway authority DfT files the count points under.
- Monmouthshire
- Gloucestershire
- Herefordshire
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 | 11 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 48 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.