Trunk A-road
A3100 traffic and collisions
The A3100 is a trunk A-road of 9.2 miles, in Surrey. This page covers its traffic at 12 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 50m vehicle miles
- Average daily traffic 14,779 vehicles a day, both directions
- Busiest section 19,826 A3100 London Rd to A3
- HGV share 0.9% of vehicle miles
- Traffic since 2019 −5.8% same count points
- Collisions, 2021 to 2025 124 51.4 per 100m vehicle miles
How busy is the A3100?
On an average day in 2025, 14,779 vehicles passed each point on the A3100, counting both directions. The busiest section is A3100 London Rd to A3 (Surrey), with 19,826 a day; the quietest listed is A25 to A246, with 10,419.
Busiest sections, 2025
A3100 London Rd to A3 carries 1.3 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A3100 London Rd to A3 Surrey · 0.5 mi · HGVs 0.5% | 19,826 |
| Primrose Ridge to Wey Court Surrey · 2.2 mi · HGVs 0.8% | 17,628 |
| A248 to Wey Court, Godalming Surrey · 1.4 mi · HGVs 1.0% | 16,578 |
| Primrose Ridge, Godalming to A286 Surrey · 0.5 mi · HGVs 0.8% | 16,041 |
| A3100 Clay Lane to A25 Surrey · 0.9 mi · HGVs 0.9% | 15,593 |
| Sandy Lane, Guildford to A248 Surrey · 1.2 mi · HGVs 1.1% | 13,086 |
| Sandy Lane to A31/A281 Surrey · 0.7 mi · HGVs 1.4% | 12,933 |
| A25 to A246 Surrey · 0.8 mi · HGVs 0.6% | 10,419 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
In Surrey · 9.2 miles
A3100 traffic and collisions by section
11 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 1 short link roads and spurs (0.2 miles) count in the road’s totals but are not listed.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A3100 London Rd to A3Surrey | 19,826 | 5 |
| 2 | A3100 Clay Lane to A25Surrey | 15,593 | 21 |
| 3 | A25 to A246Surrey | 10,419 | 12 |
| 4 | High St to York RdSurrey | 7,511 | 10 |
| 5 | Chertsey St to A25Surrey | 6,532 | 3 |
| 6 | Sandy Lane to A31/A281Surrey | 12,933 | 10 |
| 7 | Sandy Lane, Guildford to A248Surrey | 13,086 | 6 |
| 8 | A248 to Wey Court, GodalmingSurrey | 16,578 | 19 |
| 9 | Primrose Ridge to Wey CourtSurrey | 17,628 | 27 |
| 10 | Primrose Ridge, Godalming to A286Surrey | 16,041 | 4 |
| 11 | A286 to A283Surrey | 10,017 | 5 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A3100 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.
A3100 traffic by vehicle type
Cars and taxis make up 86.6% of the vehicle miles on the A3100. HGVs account for 0.9%.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 1.9% |
| 2001 | 2.0% |
| 2002 | 2.1% |
| 2003 | 2.3% |
| 2004 | 2.4% |
| 2005 | 2.0% |
| 2006 | 1.7% |
| 2007 | 1.9% |
| 2008 | 1.6% |
| 2009 | 1.3% |
| 2010 | 1.2% |
| 2011 | 1.3% |
| 2012 | 1.3% |
| 2013 | 1.3% |
| 2014 | 1.2% |
| 2015 | 1.2% |
| 2016 | 1.1% |
| 2017 | 1.1% |
| 2018 | 1.2% |
| 2019 | 1.1% |
| 2020 | 1.3% |
| 2021 | 1.3% |
| 2022 | 1.2% |
| 2023 | 1.1% |
| 2024 | 1.0% |
| 2025 | 0.9% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A3100 traffic trend
Traffic on the A3100 came to 49.6 million vehicle miles in 2025. At the count points present in both years, it is down 5.8% on 2019, before the pandemic, and down 8.0% on 2015.
Vehicle miles a year
Like for like, traffic is down 13.2% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 59m |
| 2001 | 58m |
| 2002 | 59m |
| 2003 | 58m |
| 2004 | 59m |
| 2005 | 58m |
| 2006 | 57m |
| 2007 | 57m |
| 2008 | 54m |
| 2009 | 54m |
| 2010 | 54m |
| 2011 | 54m |
| 2012 | 54m |
| 2013 | 53m |
| 2014 | 54m |
| 2015 | 54m |
| 2016 | 55m |
| 2017 | 53m |
| 2018 | 53m |
| 2019 | 53m |
| 2020 | 40m |
| 2021 | 44m |
| 2022 | 48m |
| 2023 | 49m |
| 2024 | 50m |
| 2025 | 50m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 15,950 |
| 2001 | 15,630 |
| 2002 | 15,870 |
| 2003 | 15,834 |
| 2004 | 15,959 |
| 2005 | 15,853 |
| 2006 | 15,439 |
| 2007 | 15,313 |
| 2008 | 14,569 |
| 2009 | 14,755 |
| 2010 | 14,526 |
| 2011 | 14,672 |
| 2012 | 14,535 |
| 2013 | 14,346 |
| 2014 | 14,758 |
| 2015 | 15,218 |
| 2016 | 14,818 |
| 2017 | 14,804 |
| 2018 | 14,775 |
| 2019 | 15,693 |
| 2020 | 12,012 |
| 2021 | 13,212 |
| 2022 | 14,341 |
| 2023 | 14,598 |
| 2024 | 14,971 |
| 2025 | 14,779 |
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 12 count points were counted; DfT estimated the rest from earlier counts and local trends.
A3100 collisions
Police recorded 124 collisions with the A3100 as the first road from 2021 to 2025, 22 of them fatal or serious. That is 51.4 per 100 million vehicle miles, higher than the 31.5 for all A-roads in Great Britain. On average there were 2.7 a year for each mile of road.
Reported collisions by year
About the same in 2025 as in 2021.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 21 | 3 |
| 2022 | 33 | 3 |
| 2023 | 20 | 6 |
| 2024 | 11 | 3 |
| 2025 | 17 | 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 |
|---|---|
| A3100 Clay Lane to A25 Surrey · 21 collisions | 84.6 |
| A25 to A246 Surrey · 12 collisions | 84.4 |
| Sandy Lane to A31/A281 Surrey · 10 collisions | 62.5 |
| A248 to Wey Court, Godalming Surrey · 19 collisions | 47.9 |
| Primrose Ridge to Wey Court Surrey · 27 collisions | 37.7 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 19 collisions were recorded at junctions where the A3100 was the second road; they are not in the figures above. Fatal or serious uses DfT’s adjusted serious figures. 98.4% of the collisions could be placed on a section. How we count collisions
Council areas on the A3100
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 | 12 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 124 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.