A-road
A411 traffic and collisions
The A411 is an A-road of 14.2 miles, from Barnet to Hertfordshire. This page covers its traffic at 18 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 95m vehicle miles
- Average daily traffic 18,393 vehicles a day, both directions
- Busiest section 33,297 At A4008
- HGV share 0.9% of vehicle miles
- Traffic since 2019 −3.1% same count points
- Collisions, 2021 to 2025 209 45.7 per 100m vehicle miles
How busy is the A411?
On an average day in 2025, 18,393 vehicles passed each point on the A411, counting both directions. The busiest section is At A4008 (Hertfordshire), with 33,297 a day; the quietest listed is A409 to A4140, with 9,141.
Busiest sections, 2025
At A4008 carries 1.8 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| At A4008 Hertfordshire · 1.1 mi · HGVs 1.0% | 33,297 |
| Beechen Grove split to A411 Exchange Rd Hertfordshire · 0.5 mi · HGVs 1.3% | 23,888 |
| Courtlands Drive to M25 Hertfordshire · 0.7 mi · HGVs 0.9% | 22,732 |
| A1(T) to A5183 Hertfordshire · 2.1 mi · HGVs 0.8% | 18,779 |
| A412 to Courtlands Drive Hertfordshire · 1.7 mi · HGVs 0.9% | 17,968 |
| A1000 to Quinta Drive Barnet · 1.3 mi · HGVs 0.6% | 15,534 |
| A5183 to A41(T) Hertfordshire · 1.0 mi · HGVs 0.7% | 14,555 |
| A4140 to A4008 Hertfordshire · 1.7 mi · HGVs 0.6% | 13,056 |
| Quinta Drive to A1(T) Barnet · 1.4 mi · HGVs 0.9% | 12,358 |
| A409 to A4140 Hertfordshire · 0.8 mi · HGVs 1.1% | 9,141 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Barnet to Hertfordshire · 14.2 miles
A411 traffic and collisions by section
14 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 4 short link roads and spurs (0.8 miles) count in the road’s totals but are not listed.
Sections Tap a column heading to sort
| # | |||
|---|---|---|---|
| 1 | A1000 to Quinta DriveBarnet | 15,534 | 32 |
| 2 | Quinta Drive to A1(T)Barnet | 12,358 | 14 |
| 3 | A1(T) to A5183Hertfordshire | 18,779 | 23 |
| 4 | A5183 to A41(T)Hertfordshire | 14,555 | 7 |
| 5 | A41(T) to A409Hertfordshire | 27,163 | 3 |
| 6 | A409 to A4140Hertfordshire | 9,141 | 3 |
| 7 | A4140 to A4008Hertfordshire | 13,056 | 29 |
| 8 | At A4008Hertfordshire | 15,502 | fewer than 3 |
| 9 | At A4008Hertfordshire | 33,297 | 19 |
| 10 | A4008 to A411 Beechen Grove splitHertfordshire | 33,679 | 4 |
| 11 | Beechen Grove split to A411 Exchange RdHertfordshire | 23,888 | 7 |
| 12 | A411 Exchange Rd to A412Hertfordshire | 23,640 | 10 |
| 13 | A412 to Courtlands DriveHertfordshire | 17,968 | 18 |
| 14 | Courtlands Drive to M25Hertfordshire | 22,732 | 7 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A411 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.
A411 traffic by vehicle type
Cars and taxis make up 84.2% of the vehicle miles on the A411. 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 | 1.8% |
| 2002 | 2.2% |
| 2003 | 2.5% |
| 2004 | 2.3% |
| 2005 | 2.1% |
| 2006 | 1.9% |
| 2007 | 1.9% |
| 2008 | 2.0% |
| 2009 | 1.7% |
| 2010 | 1.8% |
| 2011 | 1.7% |
| 2012 | 1.6% |
| 2013 | 1.6% |
| 2014 | 1.6% |
| 2015 | 1.6% |
| 2016 | 1.6% |
| 2017 | 1.5% |
| 2018 | 1.3% |
| 2019 | 1.3% |
| 2020 | 1.5% |
| 2021 | 1.4% |
| 2022 | 1.3% |
| 2023 | 1.1% |
| 2024 | 1.0% |
| 2025 | 0.9% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A411 traffic trend
Traffic on the A411 came to 95.3 million vehicle miles in 2025. At the count points present in both years, it is down 3.1% on 2019, before the pandemic, and down 4.0% on 2015.
Vehicle miles a year
Like for like, traffic is down 4.6% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 93m |
| 2001 | 92m |
| 2002 | 93m |
| 2003 | 92m |
| 2004 | 94m |
| 2005 | 94m |
| 2006 | 97m |
| 2007 | 95m |
| 2008 | 94m |
| 2009 | 95m |
| 2010 | 92m |
| 2011 | 96m |
| 2012 | 98m |
| 2013 | 96m |
| 2014 | 98m |
| 2015 | 97m |
| 2016 | 98m |
| 2017 | 97m |
| 2018 | 98m |
| 2019 | 98m |
| 2020 | 77m |
| 2021 | 85m |
| 2022 | 91m |
| 2023 | 92m |
| 2024 | 95m |
| 2025 | 95m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 18,798 |
| 2001 | 18,691 |
| 2002 | 18,943 |
| 2003 | 18,639 |
| 2004 | 18,993 |
| 2005 | 19,074 |
| 2006 | 19,597 |
| 2007 | 19,200 |
| 2008 | 18,971 |
| 2009 | 19,309 |
| 2010 | 18,663 |
| 2011 | 18,967 |
| 2012 | 19,262 |
| 2013 | 19,001 |
| 2014 | 19,322 |
| 2015 | 19,171 |
| 2016 | 19,309 |
| 2017 | 19,108 |
| 2018 | 18,945 |
| 2019 | 18,982 |
| 2020 | 14,853 |
| 2021 | 16,376 |
| 2022 | 17,473 |
| 2023 | 17,729 |
| 2024 | 18,300 |
| 2025 | 18,393 |
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 18 count points were counted; DfT estimated the rest from earlier counts and local trends.
A411 collisions
Police recorded 209 collisions with the A411 as the first road from 2021 to 2025, 43 of them fatal or serious. That is 45.7 per 100 million vehicle miles, higher than the 31.5 for all A-roads in Great Britain. On average there were 2.9 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 | 32 | 8 |
| 2022 | 31 | 7 |
| 2023 | 30 | 13 |
| 2024 | 41 | 7 |
| 2025 | 32 | 8 |
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 |
|---|---|
| A1000 to Quinta Drive Barnet · 32 collisions | 84.2 |
| A4140 to A4008 Hertfordshire · 29 collisions | 73.5 |
| Quinta Drive to A1(T) Barnet · 14 collisions | 51.1 |
| A1(T) to A5183 Hertfordshire · 23 collisions | 34.6 |
| A412 to Courtlands Drive Hertfordshire · 18 collisions | 33.6 |
| At A4008 Hertfordshire · 19 collisions | 28.1 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 49 collisions were recorded at junctions where the A411 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 A411
In route order. Each is the highway authority DfT files the count points under.
- Barnet
- Hertfordshire
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 | 209 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.