A-road
A320 traffic and collisions
The A320 is an A-road of 16.5 miles, in Surrey. This page covers its traffic at 18 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 114m vehicle miles
- Average daily traffic 18,861 vehicles a day, both directions
- Busiest section 33,567 A317 to A319
- HGV share 2.2% of vehicle miles
- Traffic since 2019 −5.0% same count points
- Collisions, 2021 to 2025 292 51.3 per 100m vehicle miles
How busy is the A320?
On an average day in 2025, 18,861 vehicles passed each point on the A320, counting both directions. The busiest section is A317 to A319 (Surrey), with 33,567 a day; the quietest listed is A25 to A246, with 12,893.
Busiest sections, 2025
A317 to A319 carries 1.8 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A317 to A319 Surrey · 0.6 mi · HGVs 2.4% | 33,567 |
| A319 to A245 Surrey · 2.4 mi · HGVs 2.7% | 21,987 |
| At A317 Surrey · 1.5 mi · HGVs 2.6% | 20,433 |
| A308 to Norlands Lane Surrey · 1.6 mi · HGVs 1.0% | 17,449 |
| A324 to A247 Surrey · 0.7 mi · HGVs 1.5% | 17,068 |
| A3 Slip Road, Guildford to A247 Wych Hill Lane Surrey · 4.7 mi · HGVs 2.0% | 16,492 |
| Norlands Lane to B375 St Ann's Rd Surrey · 1.2 mi · HGVs 0.8% | 15,154 |
| A245 to A3046 Surrey · 1.0 mi · HGVs 1.9% | 13,970 |
| A25 to A246 Surrey · 0.6 mi · HGVs 1.7% | 12,893 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
In Surrey · 16.5 miles
A320 traffic and collisions by section
16 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 2 short link roads and spurs (0.8 miles) count in the road’s totals but are not listed.
Show all 16 sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A308 to Norlands LaneSurrey | 17,449 | 18 |
| 2 | Norlands Lane to B375 St Ann's RdSurrey | 15,154 | 9 |
| 3 | B375 St Ann's Rd to B388Surrey | 16,175 | fewer than 3 |
| 4 | B388 to A317Surrey | 16,015 | 7 |
| 5 | At A317Surrey | 20,433 | 21 |
| 6 | A317 to A319Surrey | 33,567 | 12 |
| 7 | A319 to A245Surrey | 21,987 | 33 |
| 8 | A245 to A3046Surrey | 13,970 | 15 |
| 9 | A3046 to A324Surrey | 25,683 | 6 |
| 10 | A324 to A247Surrey | 17,068 | 28 |
| 11 | At A247Surrey | 14,904 | 6 |
| 12 | A3 Slip Road, Guildford to A247 Wych Hill LaneSurrey | 16,492 | 62 |
| 13 | A320 spur roundabout to A3Surrey | 31,472 | fewer than 3 |
| 14 | A3 to A25Surrey | 31,472 | 4 |
| 15 | A25 to A246Surrey | 12,893 | 17 |
| 16 | A246 to High StSurrey | 3,246 | 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 A320 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.
A320 traffic by vehicle type
Cars and taxis make up 83.8% of the vehicle miles on the A320. HGVs account for 2.2%.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 3.8% |
| 2001 | 3.4% |
| 2002 | 3.4% |
| 2003 | 3.3% |
| 2004 | 3.3% |
| 2005 | 3.2% |
| 2006 | 3.2% |
| 2007 | 2.9% |
| 2008 | 3.0% |
| 2009 | 2.8% |
| 2010 | 2.7% |
| 2011 | 2.8% |
| 2012 | 2.6% |
| 2013 | 2.7% |
| 2014 | 2.6% |
| 2015 | 2.6% |
| 2016 | 2.7% |
| 2017 | 2.7% |
| 2018 | 2.6% |
| 2019 | 2.5% |
| 2020 | 3.0% |
| 2021 | 2.8% |
| 2022 | 2.6% |
| 2023 | 2.4% |
| 2024 | 2.3% |
| 2025 | 2.2% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A320 traffic trend
Traffic on the A320 came to 114 million vehicle miles in 2025. At the count points present in both years, it is down 5.0% on 2019, before the pandemic, and down 7.4% on 2015.
Vehicle miles a year
Like for like, traffic is down 0.8% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 111m |
| 2001 | 111m |
| 2002 | 114m |
| 2003 | 112m |
| 2004 | 114m |
| 2005 | 111m |
| 2006 | 111m |
| 2007 | 110m |
| 2008 | 109m |
| 2009 | 108m |
| 2010 | 110m |
| 2011 | 111m |
| 2012 | 110m |
| 2013 | 108m |
| 2014 | 111m |
| 2015 | 112m |
| 2016 | 114m |
| 2017 | 110m |
| 2018 | 108m |
| 2019 | 126m |
| 2020 | 96m |
| 2021 | 107m |
| 2022 | 118m |
| 2023 | 121m |
| 2024 | 111m |
| 2025 | 114m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 19,621 |
| 2001 | 19,591 |
| 2002 | 20,211 |
| 2003 | 19,794 |
| 2004 | 20,142 |
| 2005 | 19,528 |
| 2006 | 19,614 |
| 2007 | 19,418 |
| 2008 | 19,201 |
| 2009 | 19,069 |
| 2010 | 19,419 |
| 2011 | 19,642 |
| 2012 | 19,379 |
| 2013 | 19,013 |
| 2014 | 19,567 |
| 2015 | 19,852 |
| 2016 | 20,215 |
| 2017 | 19,405 |
| 2018 | 18,942 |
| 2019 | 20,226 |
| 2020 | 15,320 |
| 2021 | 17,131 |
| 2022 | 18,499 |
| 2023 | 18,996 |
| 2024 | 18,349 |
| 2025 | 18,861 |
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 (71.5% of today’s road for 2019). In 2025, 6 of the 18 count points were counted; DfT estimated the rest from earlier counts and local trends.
A320 collisions
Police recorded 292 collisions with the A320 as the first road from 2021 to 2025, 66 of them fatal or serious. That is 51.3 per 100 million vehicle miles, higher than the 31.5 for all A-roads in Great Britain. On average there were 3.5 a year for each mile of road.
Reported collisions by year
Down 17.2% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 44 | 14 |
| 2022 | 47 | 10 |
| 2023 | 54 | 12 |
| 2024 | 44 | 19 |
| 2025 | 37 | 11 |
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 |
|---|---|
| A324 to A247 Surrey · 28 collisions | 132.5 |
| A25 to A246 Surrey · 17 collisions | 124.3 |
| A245 to A3046 Surrey · 15 collisions | 56.8 |
| A3 Slip Road, Guildford to A247 Wych Hill Lane Surrey · 62 collisions | 56.3 |
| A308 to Norlands Lane Surrey · 18 collisions | 42.2 |
| At A317 Surrey · 21 collisions | 38.4 |
| A319 to A245 Surrey · 33 collisions | 36.4 |
| A317 to A319 Surrey · 12 collisions | 34.6 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 29 collisions were recorded at junctions where the A320 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 A320
In route order. Each is the highway authority DfT files the count points under.
- Surrey
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 | 18 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 292 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.