Trunk A-road
A5123 traffic and collisions
The A5123 is a trunk A-road of 6.2 miles, in West Northamptonshire. This page covers its traffic at 7 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 47m vehicle miles
- Average daily traffic 20,717 vehicles a day, both directions
- Busiest section 27,768 A43 spur to A45
- HGV share 2.3% of vehicle miles
- Traffic since 2019 +0.2% same count points
- Collisions, 2021 to 2025 155 62.0 per 100m vehicle miles
How busy is the A5123?
On an average day in 2025, 20,717 vehicles passed each point on the A5123, counting both directions. The busiest section is A43 spur to A45 (West Northamptonshire), with 27,768 a day; the quietest listed is A5095 to A5101, with 10,943.
Busiest sections, 2025
A43 spur to A45 carries 1.3 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| A43 spur to A45 West Northamptonshire · 1.1 mi · HGVs 5.1% | 27,768 |
| A5076 to A508/A428 West Northamptonshire · 1.6 mi · HGVs 0.8% | 24,785 |
| A5101 to A43/A5076 West Northamptonshire · 1.7 mi · HGVs 0.7% | 18,921 |
| A4500 to A5095 West Northamptonshire · 0.7 mi · HGVs 0.8% | 11,960 |
| A5095 to A5101 West Northamptonshire · 0.6 mi · HGVs 0.8% | 10,943 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
In West Northamptonshire · 6.2 miles
A5123 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 | At A43 spurWest Northamptonshire | 34,273 | fewer than 3 |
| 2 | A43 spur to A45West Northamptonshire | 27,768 | 6 |
| 3 | A5076 to A508/A428West Northamptonshire | 24,785 | 50 |
| 4 | A428 to A4500West Northamptonshire | 14,289 | 14 |
| 5 | A4500 to A5095West Northamptonshire | 11,960 | 27 |
| 6 | A5095 to A5101West Northamptonshire | 10,943 | 24 |
| 7 | A5101 to A43/A5076West Northamptonshire | 18,921 | 33 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A5123 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.
A5123 traffic by vehicle type
Cars and taxis make up 82.8% of the vehicle miles on the A5123. HGVs account for 2.3%, rising to 5.1% on A43 spur to A45.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 2.2% |
| 2001 | 2.3% |
| 2002 | 2.2% |
| 2003 | 2.3% |
| 2004 | 2.9% |
| 2005 | 2.5% |
| 2006 | 2.1% |
| 2007 | 2.3% |
| 2008 | 1.8% |
| 2009 | 1.5% |
| 2010 | 1.5% |
| 2011 | 1.5% |
| 2012 | 1.4% |
| 2013 | 1.4% |
| 2014 | 1.5% |
| 2015 | 1.5% |
| 2016 | 1.3% |
| 2017 | 1.4% |
| 2018 | 1.6% |
| 2019 | 2.2% |
| 2020 | 2.5% |
| 2021 | 2.4% |
| 2022 | 2.3% |
| 2023 | 2.3% |
| 2024 | 2.3% |
| 2025 | 2.3% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A5123 traffic trend
Traffic on the A5123 came to 46.9 million vehicle miles in 2025. At the count points present in both years, it is about the same as in 2019, before the pandemic, and down 8.5% on 2015.
Vehicle miles a year
Like for like, traffic is down 15.8% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 50m |
| 2001 | 51m |
| 2002 | 51m |
| 2003 | 46m |
| 2004 | 48m |
| 2005 | 48m |
| 2006 | 49m |
| 2007 | 48m |
| 2008 | 46m |
| 2009 | 46m |
| 2010 | 46m |
| 2011 | 46m |
| 2012 | 46m |
| 2013 | 46m |
| 2014 | 46m |
| 2015 | 46m |
| 2016 | 45m |
| 2017 | 45m |
| 2018 | 46m |
| 2019 | 56m |
| 2020 | 42m |
| 2021 | 49m |
| 2022 | 53m |
| 2023 | 55m |
| 2024 | 47m |
| 2025 | 47m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 22,974 |
| 2001 | 23,130 |
| 2002 | 23,039 |
| 2003 | 20,804 |
| 2004 | 21,997 |
| 2005 | 21,822 |
| 2006 | 22,214 |
| 2007 | 21,970 |
| 2008 | 21,173 |
| 2009 | 21,068 |
| 2010 | 20,809 |
| 2011 | 20,883 |
| 2012 | 20,970 |
| 2013 | 20,795 |
| 2014 | 21,041 |
| 2015 | 20,991 |
| 2016 | 20,499 |
| 2017 | 20,214 |
| 2018 | 20,118 |
| 2019 | 21,225 |
| 2020 | 16,150 |
| 2021 | 18,711 |
| 2022 | 20,098 |
| 2023 | 20,737 |
| 2024 | 20,651 |
| 2025 | 20,717 |
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 7 count points were counted; DfT estimated the rest from earlier counts and local trends.
A5123 collisions
Police recorded 155 collisions with the A5123 as the first road from 2021 to 2025, 26 of them fatal or serious. That is 62.0 per 100 million vehicle miles, higher than the 31.5 for all A-roads in Great Britain. On average there were 5.0 a year for each mile of road.
Reported collisions by year
Up 105.6% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 15 | 3 |
| 2022 | 26 | 10 |
| 2023 | 31 | 3 |
| 2024 | 25 | 5 |
| 2025 | 31 | 6 |
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 |
|---|---|
| A5095 to A5101 West Northamptonshire · 24 collisions | 194.0 |
| A4500 to A5095 West Northamptonshire · 27 collisions | 182.3 |
| A5076 to A508/A428 West Northamptonshire · 50 collisions | 71.3 |
| A5101 to A43/A5076 West Northamptonshire · 33 collisions | 58.0 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 57 collisions were recorded at junctions where the A5123 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 A5123
In route order. Each is the highway authority DfT files the count points under.
- West Northamptonshire
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 | 7 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 155 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.