A-road
A315 traffic and collisions
The A315 is an A-road of 14.1 miles, from Westminster to Hounslow. This page covers its traffic at 23 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 77m vehicle miles
- Average daily traffic 14,928 vehicles a day, both directions
- Busiest section 21,172 A4204 to A3220
- HGV share 1.9% of vehicle miles
- Traffic since 2019 −6.9% same count points
- Collisions, 2021 to 2025 1,107 301.6 per 100m vehicle miles
How busy is the A315?
On an average day in 2025, 14,928 vehicles passed each point on the A315, counting both directions. The busiest section is A4204 to A3220 (Kensington and Chelsea), with 21,172 a day; the quietest listed is A315 Studland St to A402 Goldhawk Rd, with 9,976.
Busiest sections, 2025
A4204 to A3220 carries 1.4 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A4204 to A3220 Kensington and Chelsea · 0.7 mi · HGVs 2.7% | 21,172 |
| A3063 to A244 Hounslow · 1.2 mi · HGVs 2.2% | 18,082 |
| A312 to A30(T) Hounslow · 1.7 mi · HGVs 1.6% | 16,863 |
| B363 to A314 Hounslow · 0.7 mi · HGVs 1.2% | 15,736 |
| A4/A3216 to A4204 Westminster, Kensington and Chelsea · 1.4 mi · HGVs 3.6% | 15,730 |
| A205 to A3002 Hounslow · 0.9 mi · HGVs 1.3% | 14,959 |
| A3220 to A219/A4 Kensington and Chelsea, Hammersmith and Fulham · 1.0 mi · HGVs 1.3% | 13,879 |
| A3000 to A205 Hounslow · 0.9 mi · HGVs 2.2% | 13,873 |
| A316 to A3000 Hounslow · 0.5 mi · HGVs 1.4% | 12,909 |
| A3002 to A310 Hounslow · 0.8 mi · HGVs 2.1% | 12,783 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Westminster to Hounslow · 14.1 miles
A315 traffic and collisions by section
20 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 1 short link roads and spurs (0.6 miles) count in the road’s totals but are not listed.
Show all 20 sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A4/A3216 to A4204Westminster, Kensington and Chelsea | 15,730 | 131 |
| 2 | A4204 to A3220Kensington and Chelsea | 21,172 | 110 |
| 3 | At A3220Kensington and Chelsea | 21,172 | 16 |
| 4 | A3220 to A219/A4Kensington and Chelsea, Hammersmith and Fulham | 13,879 | 121 |
| 5 | A219/A306 to A315 Studland StHammersmith and Fulham | 11,994 | 85 |
| 6 | A315 Studland St to A402 Goldhawk RdHammersmith and Fulham | 9,976 | 82 |
| 7 | A402 to A316Hounslow | 15,958 | 19 |
| 8 | A316 to A3000Hounslow | 12,909 | 47 |
| 9 | A3000 to A205Hounslow | 13,873 | 51 |
| 10 | A205 to A3002Hounslow | 14,959 | 50 |
| 11 | A3002 to A310Hounslow | 12,783 | 57 |
| 12 | A310 to B363Hounslow | 10,624 | 41 |
| 13 | At B363Hounslow | 17,265 | 21 |
| 14 | B363 to A314Hounslow | 15,736 | 72 |
| 15 | Bell Rd to School Rd/High StHounslow | 14,707 | 13 |
| 16 | A3005/A314 to A3006Hounslow | 15,079 | 16 |
| 17 | A3006 to A3063Hounslow | 16,106 | 37 |
| 18 | A3063 to A244Hounslow | 18,082 | 62 |
| 19 | A244 to A312Hounslow | 11,101 | 10 |
| 20 | A312 to A30(T)Hounslow | 16,863 | 66 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A315 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.
A315 traffic by vehicle type
Cars and taxis make up 73.3% of the vehicle miles on the A315. HGVs account for 1.9%, rising to 3.6% on A4/A3216 to A4204.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 2.4% |
| 2001 | 2.7% |
| 2002 | 2.3% |
| 2003 | 2.3% |
| 2004 | 2.6% |
| 2005 | 2.7% |
| 2006 | 2.6% |
| 2007 | 2.5% |
| 2008 | 2.6% |
| 2009 | 2.4% |
| 2010 | 2.6% |
| 2011 | 2.7% |
| 2012 | 3.2% |
| 2013 | 3.3% |
| 2014 | 3.1% |
| 2015 | 3.1% |
| 2016 | 3.0% |
| 2017 | 2.8% |
| 2018 | 2.5% |
| 2019 | 2.0% |
| 2020 | 2.0% |
| 2021 | 2.0% |
| 2022 | 2.1% |
| 2023 | 2.1% |
| 2024 | 2.0% |
| 2025 | 1.9% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A315 traffic trend
Traffic on the A315 came to 76.8 million vehicle miles in 2025. At the count points present in both years, it is down 6.9% on 2019, before the pandemic, and down 12.1% on 2015.
Vehicle miles a year
Like for like, traffic is down 36.8% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 116m |
| 2001 | 110m |
| 2002 | 108m |
| 2003 | 107m |
| 2004 | 108m |
| 2005 | 105m |
| 2006 | 105m |
| 2007 | 105m |
| 2008 | 96m |
| 2009 | 94m |
| 2010 | 91m |
| 2011 | 86m |
| 2012 | 84m |
| 2013 | 84m |
| 2014 | 85m |
| 2015 | 87m |
| 2016 | 86m |
| 2017 | 84m |
| 2018 | 86m |
| 2019 | 83m |
| 2020 | 64m |
| 2021 | 70m |
| 2022 | 73m |
| 2023 | 73m |
| 2024 | 75m |
| 2025 | 77m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 23,557 |
| 2001 | 22,408 |
| 2002 | 21,222 |
| 2003 | 21,115 |
| 2004 | 21,205 |
| 2005 | 20,592 |
| 2006 | 20,734 |
| 2007 | 20,718 |
| 2008 | 18,963 |
| 2009 | 18,268 |
| 2010 | 17,580 |
| 2011 | 16,683 |
| 2012 | 16,237 |
| 2013 | 16,251 |
| 2014 | 16,413 |
| 2015 | 16,984 |
| 2016 | 16,672 |
| 2017 | 16,368 |
| 2018 | 16,630 |
| 2019 | 16,029 |
| 2020 | 12,373 |
| 2021 | 13,572 |
| 2022 | 14,078 |
| 2023 | 14,090 |
| 2024 | 14,648 |
| 2025 | 14,928 |
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, 6 of the 23 count points were counted; DfT estimated the rest from earlier counts and local trends.
A315 collisions
Police recorded 1,107 collisions with the A315 as the first road from 2021 to 2025, 226 of them fatal or serious, including 4 fatal. That is 301.6 per 100 million vehicle miles, higher than the 31.5 for all A-roads in Great Britain. On average there were 15.7 a year for each mile of road.
Reported collisions by year
Down 11.7% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 201 | 29 |
| 2022 | 182 | 41 |
| 2023 | 177 | 49 |
| 2024 | 169 | 56 |
| 2025 | 152 | 51 |
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 |
|---|---|
| A315 Studland St to A402 Goldhawk Rd Hammersmith and Fulham · 82 collisions | 904.4 |
| A219/A306 to A315 Studland St Hammersmith and Fulham · 85 collisions | 780.7 |
| A3220 to A219/A4 Kensington and Chelsea, Hammersmith and Fulham · 121 collisions | 479.9 |
| B363 to A314 Hounslow · 72 collisions | 428.8 |
| A4204 to A3220 Kensington and Chelsea · 110 collisions | 403.2 |
| A316 to A3000 Hounslow · 47 collisions | 400.8 |
| A4/A3216 to A4204 Westminster, Kensington and Chelsea · 131 collisions | 364.1 |
| A3002 to A310 Hounslow · 57 collisions | 302.6 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 128 collisions were recorded at junctions where the A315 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 A315
In route order. Each is the highway authority DfT files the count points under.
- Westminster
- Kensington and Chelsea
- Hammersmith and Fulham
- Hounslow
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 | 23 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 1,107 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.