A-road
A811 traffic and collisions
The A811 is an A-road of 30.2 miles, from Stirling to West Dunbartonshire. This page covers its traffic at 8 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 71m vehicle miles
- Average daily traffic 6,419 vehicles a day, both directions
- Busiest section 11,190 A813 to B857 Luss Rd
- HGV share 3.5% of vehicle miles
- Traffic since 2019 −8.9% same count points
- Collisions, 2021 to 2025 41 12.0 per 100m vehicle miles
How busy is the A811?
On an average day in 2025, 6,419 vehicles passed each point on the A811, counting both directions. The busiest section is A813 to B857 Luss Rd (West Dunbartonshire), with 11,190 a day; the quietest listed is A81 to A809, with 4,484.
Busiest sections, 2025
A813 to B857 Luss Rd carries 1.7 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A813 to B857 Luss Rd West Dunbartonshire · 0.6 mi · HGVs 1.8% | 11,190 |
| A875 Stirling · 16.3 mi · HGVs 3.4% | 6,731 |
| A809 to Drymen Rd, Alexandria Stirling, West Dunbartonshire · 6.6 mi · HGVs 3.8% | 6,386 |
| A875 to A81 Stirling · 1.5 mi · HGVs 6.7% | 5,712 |
| A81 to A809 Stirling · 4.5 mi · HGVs 3.2% | 4,484 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Stirling to West Dunbartonshire · 30.2 miles
A811 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 | A875Stirling | 6,731 | 15 |
| 2 | A875 to A81Stirling | 5,712 | fewer than 3 |
| 3 | A81 to A809Stirling | 4,484 | 6 |
| 4 | A809 to Drymen Rd, AlexandriaStirling, West Dunbartonshire | 6,386 | 12 |
| 5 | Drymen Rd to A813West Dunbartonshire | 7,453 | 0 |
| 6 | A813 to B857 Luss RdWest Dunbartonshire | 11,190 | 3 |
| 7 | B857 Luss Rd to A82West Dunbartonshire | 10,742 | 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 A811 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.
A811 traffic by vehicle type
Cars and taxis make up 77.7% of the vehicle miles on the A811. HGVs account for 3.5%, rising to 6.7% on A875 to A81.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 5.5% |
| 2001 | 5.3% |
| 2002 | 5.5% |
| 2003 | 5.5% |
| 2004 | 5.3% |
| 2005 | 5.5% |
| 2006 | 5.5% |
| 2007 | 6.1% |
| 2008 | 5.6% |
| 2009 | 5.1% |
| 2010 | 5.3% |
| 2011 | 5.2% |
| 2012 | 5.3% |
| 2013 | 4.5% |
| 2014 | 4.5% |
| 2015 | 4.6% |
| 2016 | 4.6% |
| 2017 | 4.8% |
| 2018 | 4.8% |
| 2019 | 4.9% |
| 2020 | 6.3% |
| 2021 | 6.1% |
| 2022 | 5.8% |
| 2023 | 3.6% |
| 2024 | 3.6% |
| 2025 | 3.5% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A811 traffic trend
Traffic on the A811 came to 70.8 million vehicle miles in 2025. At the count points present in both years, it is down 8.9% on 2019, before the pandemic, and down 9.7% on 2015.
Vehicle miles a year
Like for like, traffic is up 14.5% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 69m |
| 2001 | 71m |
| 2002 | 71m |
| 2003 | 73m |
| 2004 | 73m |
| 2005 | 77m |
| 2006 | 79m |
| 2007 | 80m |
| 2008 | 80m |
| 2009 | 80m |
| 2010 | 79m |
| 2011 | 80m |
| 2012 | 78m |
| 2013 | 77m |
| 2014 | 79m |
| 2015 | 79m |
| 2016 | 81m |
| 2017 | 80m |
| 2018 | 79m |
| 2019 | 80m |
| 2020 | 58m |
| 2021 | 64m |
| 2022 | 69m |
| 2023 | 69m |
| 2024 | 70m |
| 2025 | 71m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 6,130 |
| 2001 | 6,327 |
| 2002 | 6,285 |
| 2003 | 6,481 |
| 2004 | 6,514 |
| 2005 | 6,824 |
| 2006 | 7,050 |
| 2007 | 7,104 |
| 2008 | 7,083 |
| 2009 | 7,096 |
| 2010 | 7,026 |
| 2011 | 7,103 |
| 2012 | 6,971 |
| 2013 | 6,857 |
| 2014 | 7,021 |
| 2015 | 7,050 |
| 2016 | 7,215 |
| 2017 | 7,229 |
| 2018 | 7,185 |
| 2019 | 7,200 |
| 2020 | 5,279 |
| 2021 | 5,798 |
| 2022 | 6,255 |
| 2023 | 6,268 |
| 2024 | 6,345 |
| 2025 | 6,419 |
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 (46.0% of today’s road for 2019). In 2025, 0 of the 8 count points were counted; DfT estimated the rest from earlier counts and local trends.
A811 collisions
Police recorded 41 collisions with the A811 as the first road from 2021 to 2025, 22 of them fatal or serious. That is 12.0 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 0.3 a year for each mile of road.
Reported collisions by year
Up 80.0% from 2021 to 2025.
| Year | Collisions |
|---|---|
| 2021 | 5 |
| 2022 | 11 |
| 2023 | 10 |
| 2024 | 6 |
| 2025 | 9 |
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 |
|---|---|
| A809 to Drymen Rd, Alexandria Stirling, West Dunbartonshire · 12 collisions | 16.2 |
| A875 Stirling · 15 collisions | 7.7 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 7 collisions were recorded at junctions where the A811 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 A811
In route order. Each is the highway authority DfT files the count points under.
- Stirling
- West Dunbartonshire
Roadworks on the A811 in Scotland
The Scottish Road Works Register lists 6 sets of roadworks on the A811 in Scotland, 1 of them under way. 1 close the road, a lane or a slip road. From the extract of 16 September 2026.
-
A811 From Junction With A81 To Junction With Access To Craigievern, Balfron Station
-
A811 From Junction With Access To Craigievern To Junction With A809, Drymen
-
A811 Stirling Road Gartocharn To Area Boundary, Alexandria
-
A811 From Junction With A81 To Junction With Access To Craigievern, Balfron Station
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A811 Stirling Road Gartocharn To Area Boundary, Alexandria
-
A811 From Junction With U030040 To Junction With A81, Balfron Station
Works in Scotland only, and only where the register records them against the road number. The register publishes one extract a day, so works can start, finish or change after it is taken. Roadworks across Scotland
Source:SRWR Extract of 2026-09-16 Updated
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 | 41 reported collisions | 15 September 2026 |
| Roadworks | Scottish Road Works Register open data Scottish Road Works Commissioner | Extract of 2026-09-16 | 22,074 sets of roadworks recorded in Scotland | 16 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.