A-road
A3057 traffic and collisions
The A3057 is an A-road of 25.7 miles, from Hampshire to Southampton. This page covers its traffic at 13 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 80m vehicle miles
- Average daily traffic 8,517 vehicles a day, both directions
- Busiest section 17,959 M271 to A27
- HGV share 2.3% of vehicle miles
- Traffic since 2019 −7.0% same count points
- Collisions, 2021 to 2025 221 57.3 per 100m vehicle miles
How busy is the A3057?
On an average day in 2025, 8,517 vehicles passed each point on the A3057, counting both directions. The busiest section is M271 to A27 (Hampshire), with 17,959 a day; the quietest listed is A303(T) to A30, with 5,380.
Busiest sections, 2025
M271 to A27 carries 2.1 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| M271 to A27 Hampshire · 1.6 mi · HGVs 3.1% | 17,959 |
| A3057 Winchester Rd to A3093 Hampshire · 0.9 mi · HGVs 0.3% | 13,681 |
| A3057 Western Ave/Eastern Ave to Wellesley Rd Hampshire · 0.5 mi · HGVs 1.0% | 13,124 |
| Balmoral Way to Roundabout with M271/A3057 Hampshire · 1.0 mi · HGVs 1.0% | 12,762 |
| Roundabout with M271/A3057 to Lower Brownhill Rd Southampton · 0.6 mi · HGVs 1.0% | 12,762 |
| Lower Brownhill Rd to A35 Southampton · 0.9 mi · HGVs 2.4% | 11,440 |
| A35 to A3024 Southampton · 1.9 mi · HGVs 0.7% | 10,998 |
| A3090 to Fishlake Meadows Hampshire · 0.8 mi · HGVs 4.5% | 8,382 |
| A30 to Fishlake Meadows, Romsey Hampshire · 9.5 mi · HGVs 3.5% | 5,609 |
| A303(T) to A30 Hampshire · 6.4 mi · HGVs 3.0% | 5,380 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Hampshire to Southampton · 25.7 miles
A3057 traffic and collisions by section
11 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 2 short link roads and spurs (1.4 miles) count in the road’s totals but are not listed.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A3057 Winchester Rd to A3093Hampshire | 13,681 | 16 |
| 2 | A3057 Western Ave/Eastern Ave to Wellesley RdHampshire | 13,124 | 3 |
| 3 | Wellesley Rd to A303(T)Hampshire | 11,943 | fewer than 3 |
| 4 | A303(T) to A30Hampshire | 5,380 | 22 |
| 5 | A30 to Fishlake Meadows, RomseyHampshire | 5,609 | 35 |
| 6 | A3090 to Fishlake MeadowsHampshire | 8,382 | 3 |
| 7 | M271 to A27Hampshire | 17,959 | 6 |
| 8 | Balmoral Way to Roundabout with M271/A3057Hampshire | 12,762 | 13 |
| 9 | Roundabout with M271/A3057 to Lower Brownhill RdSouthampton | 12,762 | 8 |
| 10 | Lower Brownhill Rd to A35Southampton | 11,440 | 12 |
| 11 | A35 to A3024Southampton | 10,998 | 80 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A3057 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.
A3057 traffic by vehicle type
Cars and taxis make up 81.8% of the vehicle miles on the A3057. HGVs account for 2.3%, rising to 4.5% on A3090 to Fishlake Meadows.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 3.3% |
| 2001 | 3.6% |
| 2002 | 3.0% |
| 2003 | 2.9% |
| 2004 | 3.0% |
| 2005 | 3.5% |
| 2006 | 3.6% |
| 2007 | 3.9% |
| 2008 | 3.1% |
| 2009 | 2.8% |
| 2010 | 2.8% |
| 2011 | 2.8% |
| 2012 | 2.9% |
| 2013 | 2.9% |
| 2014 | 2.9% |
| 2015 | 2.9% |
| 2016 | 2.9% |
| 2017 | 2.2% |
| 2018 | 2.2% |
| 2019 | 2.2% |
| 2020 | 2.6% |
| 2021 | 2.8% |
| 2022 | 2.4% |
| 2023 | 2.3% |
| 2024 | 2.2% |
| 2025 | 2.3% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A3057 traffic trend
Traffic on the A3057 came to 79.9 million vehicle miles in 2025. At the count points present in both years, it is down 7.0% on 2019, before the pandemic, and up 2.0% on 2015.
Vehicle miles a year
Like for like, traffic is about the same as in 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 74m |
| 2001 | 77m |
| 2002 | 79m |
| 2003 | 81m |
| 2004 | 80m |
| 2005 | 79m |
| 2006 | 78m |
| 2007 | 78m |
| 2008 | 77m |
| 2009 | 75m |
| 2010 | 74m |
| 2011 | 75m |
| 2012 | 74m |
| 2013 | 75m |
| 2014 | 77m |
| 2015 | 78m |
| 2016 | 79m |
| 2017 | 84m |
| 2018 | 86m |
| 2019 | 85m |
| 2020 | 65m |
| 2021 | 70m |
| 2022 | 77m |
| 2023 | 79m |
| 2024 | 80m |
| 2025 | 80m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 7,744 |
| 2001 | 8,046 |
| 2002 | 8,273 |
| 2003 | 8,490 |
| 2004 | 8,385 |
| 2005 | 8,255 |
| 2006 | 8,156 |
| 2007 | 8,171 |
| 2008 | 8,072 |
| 2009 | 7,849 |
| 2010 | 7,811 |
| 2011 | 7,892 |
| 2012 | 7,814 |
| 2013 | 7,829 |
| 2014 | 8,050 |
| 2015 | 8,147 |
| 2016 | 8,335 |
| 2017 | 8,799 |
| 2018 | 8,908 |
| 2019 | 9,034 |
| 2020 | 6,875 |
| 2021 | 7,475 |
| 2022 | 8,232 |
| 2023 | 8,401 |
| 2024 | 8,527 |
| 2025 | 8,517 |
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, 5 of the 13 count points were counted; DfT estimated the rest from earlier counts and local trends.
A3057 collisions
Police recorded 221 collisions with the A3057 as the first road from 2021 to 2025, 50 of them fatal or serious, including 4 fatal. That is 57.3 per 100 million vehicle miles, higher than the 31.5 for all A-roads in Great Britain. On average there were 1.7 a year for each mile of road.
Reported collisions by year
Up 18.9% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 33 | 4 |
| 2022 | 42 | 10 |
| 2023 | 33 | 18 |
| 2024 | 26 | 11 |
| 2025 | 37 | 7 |
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 |
|---|---|
| A35 to A3024 Southampton · 80 collisions | 226.9 |
| A3057 Winchester Rd to A3093 Hampshire · 16 collisions | 73.5 |
| Lower Brownhill Rd to A35 Southampton · 12 collisions | 65.9 |
| Balmoral Way to Roundabout with M271/A3057 Hampshire · 13 collisions | 60.9 |
| A30 to Fishlake Meadows, Romsey Hampshire · 35 collisions | 36.0 |
| A303(T) to A30 Hampshire · 22 collisions | 35.6 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 22 collisions were recorded at junctions where the A3057 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 A3057
In route order. Each is the highway authority DfT files the count points under.
- Hampshire
- Southampton
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 | 13 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.