A-road
A343 traffic and collisions
The A343 is an A-road of 27.4 miles, from West Berkshire to Wiltshire. This page covers its traffic at 11 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 81m vehicle miles
- Average daily traffic 8,132 vehicles a day, both directions
- Busiest section 14,557 A303/A342 roundabout to A3057
- HGV share 1.9% of vehicle miles
- Traffic since 2019 −0.7% same count points
- Collisions, 2021 to 2025 98 25.4 per 100m vehicle miles
How busy is the A343?
On an average day in 2025, 8,132 vehicles passed each point on the A343, counting both directions. The busiest section is A303/A342 roundabout to A3057 (Hampshire), with 14,557 a day; the quietest listed is B3048 to Saxon Way, Andover, with 5,011.
Busiest sections, 2025
A303/A342 roundabout to A3057 carries 1.8 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A303/A342 roundabout to A3057 Hampshire · 2.2 mi · HGVs 0.9% | 14,557 |
| Garden Close Lane to A339 West Berkshire · 2.2 mi · HGVs 0.6% | 13,023 |
| A3057/A3093 to Saxon Way Hampshire · 1.1 mi · HGVs 1.1% | 12,880 |
| B3084 to A303 Hampshire · 5.3 mi · HGVs 3.7% | 10,081 |
| Garden Close Lane, Newbury to A34 West Berkshire, Hampshire · 0.8 mi · HGVs 0.8% | 9,283 |
| B3084 to A30 Hampshire, Wiltshire · 2.8 mi · HGVs 3.1% | 7,261 |
| A34 to B3048 Hampshire · 8.8 mi · HGVs 1.4% | 5,018 |
| B3048 to Saxon Way, Andover Hampshire · 3.9 mi · HGVs 1.5% | 5,011 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
West Berkshire to Wiltshire · 27.4 miles
A343 traffic and collisions by section
9 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 | Garden Close Lane to A339West Berkshire | 13,023 | 16 |
| 2 | Garden Close Lane, Newbury to A34West Berkshire, Hampshire | 9,283 | 0 |
| 3 | A34 to B3048Hampshire | 5,018 | 21 |
| 4 | B3048 to Saxon Way, AndoverHampshire | 5,011 | 7 |
| 5 | A3057/A3093 to Saxon WayHampshire | 12,880 | 14 |
| 6 | A303/A342 roundabout to A3057Hampshire | 14,557 | 14 |
| 7 | B3084 to A303Hampshire | 10,081 | 20 |
| 8 | B3084 Romsey Rd to B3084 Wallop RdHampshire | 10,284 | 0 |
| 9 | B3084 to A30Hampshire, Wiltshire | 7,261 | 6 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A343 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.
A343 traffic by vehicle type
Cars and taxis make up 80.4% of the vehicle miles on the A343. HGVs account for 1.9%, rising to 3.7% on B3084 to A303.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 4.6% |
| 2001 | 3.6% |
| 2002 | 3.5% |
| 2003 | 3.7% |
| 2004 | 3.8% |
| 2005 | 3.5% |
| 2006 | 3.4% |
| 2007 | 3.3% |
| 2008 | 3.4% |
| 2009 | 3.1% |
| 2010 | 3.2% |
| 2011 | 3.2% |
| 2012 | 3.3% |
| 2013 | 3.3% |
| 2014 | 3.2% |
| 2015 | 3.1% |
| 2016 | 3.1% |
| 2017 | 2.5% |
| 2018 | 2.4% |
| 2019 | 2.3% |
| 2020 | 2.6% |
| 2021 | 2.4% |
| 2022 | 2.3% |
| 2023 | 2.1% |
| 2024 | 2.0% |
| 2025 | 1.9% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A343 traffic trend
Traffic on the A343 came to 81.3 million vehicle miles in 2025. At the count points present in both years, it is down 0.7% on 2019, before the pandemic, and up 6.2% on 2015.
Vehicle miles a year
Like for like, traffic is up 0.6% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 76m |
| 2001 | 72m |
| 2002 | 72m |
| 2003 | 74m |
| 2004 | 75m |
| 2005 | 73m |
| 2006 | 73m |
| 2007 | 75m |
| 2008 | 73m |
| 2009 | 73m |
| 2010 | 72m |
| 2011 | 73m |
| 2012 | 71m |
| 2013 | 71m |
| 2014 | 73m |
| 2015 | 73m |
| 2016 | 73m |
| 2017 | 76m |
| 2018 | 79m |
| 2019 | 82m |
| 2020 | 63m |
| 2021 | 71m |
| 2022 | 76m |
| 2023 | 78m |
| 2024 | 80m |
| 2025 | 81m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 7,770 |
| 2001 | 7,351 |
| 2002 | 7,419 |
| 2003 | 7,565 |
| 2004 | 7,727 |
| 2005 | 7,505 |
| 2006 | 7,509 |
| 2007 | 7,722 |
| 2008 | 7,451 |
| 2009 | 7,450 |
| 2010 | 7,400 |
| 2011 | 7,459 |
| 2012 | 7,299 |
| 2013 | 7,244 |
| 2014 | 7,437 |
| 2015 | 7,468 |
| 2016 | 7,490 |
| 2017 | 7,754 |
| 2018 | 7,972 |
| 2019 | 8,186 |
| 2020 | 6,247 |
| 2021 | 7,046 |
| 2022 | 7,582 |
| 2023 | 7,817 |
| 2024 | 7,990 |
| 2025 | 8,132 |
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, 2 of the 11 count points were counted; DfT estimated the rest from earlier counts and local trends.
A343 collisions
Police recorded 98 collisions with the A343 as the first road from 2021 to 2025, fewer than 3 of them fatal or serious. That is 25.4 per 100 million vehicle miles, lower than 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 84.6% from 2021 to 2025.
| Year | Collisions |
|---|---|
| 2021 | 13 |
| 2022 | 20 |
| 2023 | 22 |
| 2024 | 19 |
| 2025 | 24 |
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 |
|---|---|
| A3057/A3093 to Saxon Way Hampshire · 14 collisions | 55.9 |
| Garden Close Lane to A339 West Berkshire · 16 collisions | 32.5 |
| A34 to B3048 Hampshire · 21 collisions | 28.1 |
| A303/A342 roundabout to A3057 Hampshire · 14 collisions | 24.8 |
| B3084 to A303 Hampshire · 20 collisions | 21.3 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 19 collisions were recorded at junctions where the A343 was the second road; they are not in the figures above. Fatal or serious uses DfT’s adjusted serious figures. 100.0% of the collisions could be placed on a section. How we count collisions
Council areas on the A343
In route order. Each is the highway authority DfT files the count points under.
- West Berkshire
- Hampshire
- Wiltshire
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 | 98 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.