Trunk A-road
A339 traffic and collisions
The A339 is a trunk A-road of 33.6 miles, from Hampshire to West Berkshire. This page covers its traffic at 16 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 244m vehicle miles
- Average daily traffic 19,864 vehicles a day, both directions
- Busiest section 62,130 A3010 to A33
- HGV share 4.3% of vehicle miles
- Traffic since 2019 −2.1% same count points
- Collisions, 2021 to 2025 221 20.6 per 100m vehicle miles
How busy is the A339?
On an average day in 2025, 19,864 vehicles passed each point on the A339, counting both directions. The busiest section is A3010 to A33 (Hampshire), with 62,130 a day; the quietest listed is B3349 Basingstoke Rd, Alton to Grove Rd, Basingstoke, with 9,672.
Busiest sections, 2025
A3010 to A33 carries 3.1 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A3010 to A33 Hampshire · 1.0 mi · HGVs 3.7% | 62,130 |
| A33 to A340 Hampshire · 1.6 mi · HGVs 3.5% | 46,593 |
| A340 Ringway West to A340 Aldermaston Road Hampshire · 0.6 mi · HGVs 2.1% | 41,796 |
| A343 to A4 intersection West Berkshire · 0.9 mi · HGVs 2.4% | 41,781 |
| PINCHINGTON LANE to A343 West Berkshire · 0.8 mi · HGVs 3.6% | 26,198 |
| B4640 to PINCHINGTON LANE West Berkshire · 0.9 mi · HGVs 5.0% | 25,636 |
| A4 intersection to A34 West Berkshire · 2.3 mi · HGVs 5.9% | 24,059 |
| A340 to Roman Rd Hampshire · 0.6 mi · HGVs 5.3% | 19,616 |
| Roman Rd, Basingstoke to B3051 Hampshire · 7.1 mi · HGVs 5.3% | 17,672 |
| B3051 to Old A34 Hampshire, West Berkshire · 5.7 mi · HGVs 6.4% | 15,479 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Hampshire to West Berkshire · 33.6 miles
A339 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 | A31 to Butts LaneHampshire | 11,647 | 8 |
| 2 | B3349 Basingstoke Rd to Butts RdHampshire | 12,799 | 3 |
| 3 | B3349 Basingstoke Rd, Alton to Grove Rd, BasingstokeHampshire | 9,672 | 35 |
| 4 | Grove Rd to A30Hampshire | 10,736 | fewer than 3 |
| 5 | A30 to A3010Hampshire | 67,471 | 18 |
| 6 | A3010 to A33Hampshire | 62,130 | 13 |
| 7 | A33 to A340Hampshire | 46,593 | 8 |
| 8 | A340 Ringway West to A340 Aldermaston RoadHampshire | 41,796 | 11 |
| 9 | A340 to Roman RdHampshire | 19,616 | 7 |
| 10 | Roman Rd, Basingstoke to B3051Hampshire | 17,672 | 35 |
| 11 | B3051 to Old A34Hampshire, West Berkshire | 15,479 | 35 |
| 12 | B4640 to PINCHINGTON LANEWest Berkshire | 25,636 | fewer than 3 |
| 13 | PINCHINGTON LANE to A343West Berkshire | 26,198 | 9 |
| 14 | A343 to A4 intersectionWest Berkshire | 41,781 | 21 |
| 15 | A4 intersection to A34West Berkshire | 24,059 | 9 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A339 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.
A339 traffic by vehicle type
Cars and taxis make up 78.5% of the vehicle miles on the A339. HGVs account for 4.3%, rising to 6.4% on B3051 to Old A34.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 5.5% |
| 2001 | 5.5% |
| 2002 | 5.2% |
| 2003 | 5.2% |
| 2004 | 5.1% |
| 2005 | 5.0% |
| 2006 | 4.9% |
| 2007 | 5.2% |
| 2008 | 4.9% |
| 2009 | 4.5% |
| 2010 | 4.8% |
| 2011 | 4.8% |
| 2012 | 4.9% |
| 2013 | 4.8% |
| 2014 | 4.7% |
| 2015 | 4.7% |
| 2016 | 4.5% |
| 2017 | 4.6% |
| 2018 | 4.5% |
| 2019 | 4.5% |
| 2020 | 5.6% |
| 2021 | 5.5% |
| 2022 | 5.0% |
| 2023 | 4.8% |
| 2024 | 4.4% |
| 2025 | 4.3% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A339 traffic trend
Traffic on the A339 came to 244 million vehicle miles in 2025. At the count points present in both years, it is down 2.1% on 2019, before the pandemic, and down 0.5% on 2015.
Vehicle miles a year
Like for like, traffic is up 5.7% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 213m |
| 2001 | 214m |
| 2002 | 215m |
| 2003 | 221m |
| 2004 | 225m |
| 2005 | 227m |
| 2006 | 229m |
| 2007 | 225m |
| 2008 | 232m |
| 2009 | 230m |
| 2010 | 225m |
| 2011 | 227m |
| 2012 | 224m |
| 2013 | 219m |
| 2014 | 225m |
| 2015 | 226m |
| 2016 | 230m |
| 2017 | 227m |
| 2018 | 235m |
| 2019 | 237m |
| 2020 | 170m |
| 2021 | 187m |
| 2022 | 204m |
| 2023 | 211m |
| 2024 | 230m |
| 2025 | 244m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 17,437 |
| 2001 | 17,514 |
| 2002 | 17,617 |
| 2003 | 18,100 |
| 2004 | 18,394 |
| 2005 | 18,536 |
| 2006 | 18,760 |
| 2007 | 18,416 |
| 2008 | 18,993 |
| 2009 | 18,821 |
| 2010 | 18,410 |
| 2011 | 18,522 |
| 2012 | 18,321 |
| 2013 | 17,926 |
| 2014 | 18,399 |
| 2015 | 18,749 |
| 2016 | 18,775 |
| 2017 | 18,852 |
| 2018 | 19,252 |
| 2019 | 19,585 |
| 2020 | 14,057 |
| 2021 | 15,541 |
| 2022 | 16,911 |
| 2023 | 17,527 |
| 2024 | 19,084 |
| 2025 | 19,864 |
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 (89.6% of today’s road for 2019). In 2025, 3 of the 16 count points were counted; DfT estimated the rest from earlier counts and local trends.
A339 collisions
Police recorded 221 collisions with the A339 as the first road from 2021 to 2025, 64 of them fatal or serious, including 6 fatal. That is 20.6 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 1.3 a year for each mile of road.
Reported collisions by year
Down 24.4% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 33 | 12 |
| 2022 | 32 | 11 |
| 2023 | 33 | 17 |
| 2024 | 38 | 11 |
| 2025 | 21 | 13 |
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 |
|---|---|
| A3010 to A33 Hampshire · 13 collisions | 57.3 |
| A343 to A4 intersection West Berkshire · 21 collisions | 31.8 |
| A340 Ringway West to A340 Aldermaston Road Hampshire · 11 collisions | 25.2 |
| B3051 to Old A34 Hampshire, West Berkshire · 35 collisions | 22.7 |
| B3349 Basingstoke Rd, Alton to Grove Rd, Basingstoke Hampshire · 35 collisions | 19.9 |
| Roman Rd, Basingstoke to B3051 Hampshire · 35 collisions | 18.1 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 31 collisions were recorded at junctions where the A339 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 A339
In route order. Each is the highway authority DfT files the count points under.
- Hampshire
- West Berkshire
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 | 16 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 221 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.