A-road
A4074 traffic and collisions
The A4074 is an A-road of 22.2 miles, from Reading to Oxfordshire. This page covers its traffic at 8 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 103m vehicle miles
- Average daily traffic 12,694 vehicles a day, both directions
- Busiest section 23,874 slip to Grenoble Rd to A4142/A423
- HGV share 4.0% of vehicle miles
- Traffic since 2019 −7.1% same count points
- Collisions, 2021 to 2025 96 19.5 per 100m vehicle miles
How busy is the A4074?
On an average day in 2025, 12,694 vehicles passed each point on the A4074, counting both directions. The busiest section is slip to Grenoble Rd to A4142/A423 (Oxfordshire), with 23,874 a day; the quietest listed is A4155 to A4130, with 8,393.
Busiest sections, 2025
slip to Grenoble Rd to A4142/A423 carries 1.9 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| slip to Grenoble Rd to A4142/A423 Oxfordshire · 0.7 mi · HGVs 3.5% | 23,874 |
| A4130W to A4130E Oxfordshire · 0.7 mi · HGVs 3.3% | 23,336 |
| A4130 Crowmarsh gifford Rnbt to B 4009 Junction BENSON Oxfordshire · 3.0 mi · HGVs 4.5% | 17,515 |
| B4015 to slip to Grenoble Rd Oxfordshire · 3.0 mi · HGVs 3.9% | 17,260 |
| A329 to A415 Oxfordshire · 2.7 mi · HGVs 3.8% | 14,602 |
| A415 to B4015 Oxfordshire · 1.3 mi · HGVs 4.7% | 11,042 |
| A4155 to A4130 Reading, Oxfordshire · 10.8 mi · HGVs 3.9% | 8,393 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Reading to Oxfordshire · 22.2 miles
A4074 traffic and collisions by section
7 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 | A4155 to A4130Reading, Oxfordshire | 8,393 | 42 |
| 2 | A4130W to A4130EOxfordshire | 23,336 | 5 |
| 3 | A4130 Crowmarsh gifford Rnbt to B 4009 Junction BENSONOxfordshire | 17,515 | 15 |
| 4 | A329 to A415Oxfordshire | 14,602 | 14 |
| 5 | A415 to B4015Oxfordshire | 11,042 | 10 |
| 6 | B4015 to slip to Grenoble RdOxfordshire | 17,260 | 8 |
| 7 | slip to Grenoble Rd to A4142/A423Oxfordshire | 23,874 | 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 A4074 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.
A4074 traffic by vehicle type
Cars and taxis make up 78.8% of the vehicle miles on the A4074. HGVs account for 4.0%.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 4.2% |
| 2001 | 3.8% |
| 2002 | 3.6% |
| 2003 | 3.5% |
| 2004 | 3.6% |
| 2005 | 3.6% |
| 2006 | 3.8% |
| 2007 | 3.6% |
| 2008 | 3.4% |
| 2009 | 3.2% |
| 2010 | 3.3% |
| 2011 | 3.3% |
| 2012 | 3.3% |
| 2013 | 3.5% |
| 2014 | 3.4% |
| 2015 | 3.5% |
| 2016 | 3.5% |
| 2017 | 3.6% |
| 2018 | 3.6% |
| 2019 | 3.6% |
| 2020 | 4.4% |
| 2021 | 4.4% |
| 2022 | 4.2% |
| 2023 | 4.1% |
| 2024 | 4.0% |
| 2025 | 4.0% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A4074 traffic trend
Traffic on the A4074 came to 103 million vehicle miles in 2025. At the count points present in both years, it is down 7.1% on 2019, before the pandemic, and down 7.7% on 2015.
Vehicle miles a year
Like for like, traffic is down 4.5% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 108m |
| 2001 | 106m |
| 2002 | 112m |
| 2003 | 114m |
| 2004 | 114m |
| 2005 | 112m |
| 2006 | 112m |
| 2007 | 114m |
| 2008 | 111m |
| 2009 | 110m |
| 2010 | 108m |
| 2011 | 108m |
| 2012 | 107m |
| 2013 | 106m |
| 2014 | 109m |
| 2015 | 111m |
| 2016 | 114m |
| 2017 | 116m |
| 2018 | 113m |
| 2019 | 111m |
| 2020 | 83m |
| 2021 | 91m |
| 2022 | 98m |
| 2023 | 99m |
| 2024 | 101m |
| 2025 | 103m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 13,290 |
| 2001 | 13,058 |
| 2002 | 13,765 |
| 2003 | 14,096 |
| 2004 | 14,112 |
| 2005 | 13,839 |
| 2006 | 13,835 |
| 2007 | 14,064 |
| 2008 | 13,742 |
| 2009 | 13,550 |
| 2010 | 13,357 |
| 2011 | 13,382 |
| 2012 | 13,155 |
| 2013 | 13,074 |
| 2014 | 13,413 |
| 2015 | 13,745 |
| 2016 | 14,063 |
| 2017 | 14,269 |
| 2018 | 13,955 |
| 2019 | 13,670 |
| 2020 | 10,267 |
| 2021 | 11,181 |
| 2022 | 12,122 |
| 2023 | 12,261 |
| 2024 | 12,493 |
| 2025 | 12,694 |
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 8 count points were counted; DfT estimated the rest from earlier counts and local trends.
A4074 collisions
Police recorded 96 collisions with the A4074 as the first road from 2021 to 2025, 41 of them fatal or serious. That is 19.5 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 0.9 a year for each mile of road.
Reported collisions by year
Down 35.3% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 11 | 6 |
| 2022 | 18 | 7 |
| 2023 | 16 | 13 |
| 2024 | 5 | 9 |
| 2025 | 6 | 5 |
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 |
|---|---|
| A415 to B4015 Oxfordshire · 10 collisions | 37.1 |
| A4155 to A4130 Reading, Oxfordshire · 42 collisions | 26.5 |
| A329 to A415 Oxfordshire · 14 collisions | 20.0 |
| A4130 Crowmarsh gifford Rnbt to B 4009 Junction BENSON Oxfordshire · 15 collisions | 16.5 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 6 collisions were recorded at junctions where the A4074 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 A4074
In route order. Each is the highway authority DfT files the count points under.
- Reading
- Oxfordshire
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 | 8 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 96 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.