Trunk A-road
A737 traffic and collisions
The A737 is a trunk A-road of 26.3 miles, from Renfrewshire to North Ayrshire. This page covers its traffic at 15 DfT count points since 2000 and the collisions police recorded on it.
- Traffic in 2025 171m vehicle miles
- Average daily traffic 17,771 vehicles a day, both directions
- Busiest section 59,989 M8 to A761
- HGV share 4.1% of vehicle miles
- Traffic since 2019 −1.5% same count points
- Collisions, 2021 to 2025 73 9.3 per 100m vehicle miles
How busy is the A737?
On an average day in 2025, 17,771 vehicles passed each point on the A737, counting both directions. The busiest section is M8 to A761 (Renfrewshire), with 59,989 a day; the quietest listed is A736 to A71, with 6,867.
Busiest sections, 2025
M8 to A761 carries 3.4 times the road’s average flow.
| Section | Vehicles a day |
|---|---|
| M8 to A761 Renfrewshire · 1.2 mi · HGVs 3.7% | 59,989 |
| A761 to B787 Renfrewshire · 5.0 mi · HGVs 4.5% | 25,549 |
| B787 to A760 Renfrewshire · 2.1 mi · HGVs 6.4% | 23,183 |
| Carson Drive, Irvine to A78 North Ayrshire · 0.7 mi · HGVs 1.8% | 14,206 |
| A760 to Council boundary Renfrewshire · 1.6 mi · HGVs 4.2% | 12,562 |
| Near Watercut Road (minor road) intersection with A737 North Ayrshire · 9.8 mi · HGVs 4.2% | 12,562 |
| Near Watercut Road (minor road) intersection with A737 to A738/A737 (Dalry Road) intersection North Ayrshire · 1.4 mi · HGVs 2.8% | 12,521 |
| A737 spur to A78 to B779 Sandy Road North Ayrshire · 0.6 mi · HGVs 2.3% | 11,621 |
| B779 Sandy Road to A736 North Ayrshire · 0.7 mi · HGVs 0.6% | 10,747 |
| A736 to A71 North Ayrshire · 1.2 mi · HGVs 2.3% | 6,867 |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Route
Renfrewshire to North Ayrshire · 26.3 miles
A737 traffic and collisions by section
13 sections between junctions, in route order. Each is the average of its DfT count points, weighted by length. 2 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 | A726 to M8Renfrewshire | 23,996 | 0 |
| 2 | M8 to A761Renfrewshire | 59,989 | 3 |
| 3 | A761 to B787Renfrewshire | 25,549 | 16 |
| 4 | B787 to A760Renfrewshire | 23,183 | 8 |
| 5 | A760 to Council boundaryRenfrewshire | 12,562 | fewer than 3 |
| 6 | Near Watercut Road (minor road) intersection with A737North Ayrshire | 12,562 | 19 |
| 7 | Near Watercut Road (minor road) intersection with A737 to A738/A737 (Dalry Road) intersectionNorth Ayrshire | 12,521 | 4 |
| 8 | At A737 spur to A78North Ayrshire | 5,162 | fewer than 3 |
| 9 | A737 spur to A78 to B779 Sandy RoadNorth Ayrshire | 11,621 | 3 |
| 10 | B779 Sandy Road to A736North Ayrshire | 10,747 | 3 |
| 11 | A736 to A71North Ayrshire | 6,867 | 6 |
| 12 | A71 to Carson Drive, IrvineNorth Ayrshire | 14,798 | 3 |
| 13 | Carson Drive, Irvine to A78North Ayrshire | 14,206 | 0 |
Vehicles a day is the average daily flow in 2025. “Since 2019” compares the same count points. Collisions are those with the A737 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.
A737 traffic by vehicle type
Cars and taxis make up 78.3% of the vehicle miles on the A737. HGVs account for 4.1%, rising to 6.4% on B787 to A760.
Vehicle mix, 2025
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
HGV share of traffic
| Year | HGV share |
|---|---|
| 2000 | 4.5% |
| 2001 | 4.4% |
| 2002 | 4.5% |
| 2003 | 4.7% |
| 2004 | 5.1% |
| 2005 | 5.2% |
| 2006 | 5.2% |
| 2007 | 5.2% |
| 2008 | 5.1% |
| 2009 | 4.9% |
| 2010 | 5.1% |
| 2011 | 5.2% |
| 2012 | 5.3% |
| 2013 | 5.4% |
| 2014 | 5.2% |
| 2015 | 5.2% |
| 2016 | 4.4% |
| 2017 | 4.3% |
| 2018 | 4.3% |
| 2019 | 4.3% |
| 2020 | 4.2% |
| 2021 | 4.1% |
| 2022 | 3.7% |
| 2023 | 4.1% |
| 2024 | 4.1% |
| 2025 | 4.1% |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
A737 traffic trend
Traffic on the A737 came to 171 million vehicle miles in 2025. At the count points present in both years, it is down 1.5% on 2019, before the pandemic, and about the same as in 2015.
Vehicle miles a year
Like for like, traffic is up 26.9% on 2000.
| Year | Vehicle miles |
|---|---|
| 2000 | 131m |
| 2001 | 136m |
| 2002 | 141m |
| 2003 | 159m |
| 2004 | 165m |
| 2005 | 162m |
| 2006 | 158m |
| 2007 | 156m |
| 2008 | 154m |
| 2009 | 153m |
| 2010 | 151m |
| 2011 | 151m |
| 2012 | 148m |
| 2013 | 147m |
| 2014 | 152m |
| 2015 | 157m |
| 2016 | 153m |
| 2017 | 156m |
| 2018 | 156m |
| 2019 | 157m |
| 2020 | 121m |
| 2021 | 140m |
| 2022 | 155m |
| 2023 | 157m |
| 2024 | 163m |
| 2025 | 171m |
Source:DfT,UK Motoring analysis 2000 to 2025 Updated
Average daily flow
| Year | Vehicles a day |
|---|---|
| 2000 | 13,623 |
| 2001 | 14,185 |
| 2002 | 14,709 |
| 2003 | 16,568 |
| 2004 | 17,206 |
| 2005 | 16,870 |
| 2006 | 16,432 |
| 2007 | 16,208 |
| 2008 | 16,009 |
| 2009 | 15,911 |
| 2010 | 15,738 |
| 2011 | 15,746 |
| 2012 | 15,378 |
| 2013 | 15,330 |
| 2014 | 15,858 |
| 2015 | 16,366 |
| 2016 | 15,927 |
| 2017 | 16,248 |
| 2018 | 16,041 |
| 2019 | 16,305 |
| 2020 | 12,644 |
| 2021 | 14,659 |
| 2022 | 16,253 |
| 2023 | 16,526 |
| 2024 | 16,927 |
| 2025 | 17,771 |
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 (55.5% of today’s road for 2019). In 2025, 6 of the 15 count points were counted; DfT estimated the rest from earlier counts and local trends.
A737 collisions
Police recorded 73 collisions with the A737 as the first road from 2021 to 2025, 30 of them fatal or serious, including 3 fatal. That is 9.3 per 100 million vehicle miles, lower than the 31.5 for all A-roads in Great Britain. On average there were 0.6 a year for each mile of road.
Reported collisions by year
Up 43.8% from 2021 to 2025.
| Year | Slight | Fatal or serious |
|---|---|---|
| 2021 | 10 | 6 |
| 2022 | 4 | 3 |
| 2023 | 5 | 6 |
| 2024 | 9 | 7 |
| 2025 | 15 | 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 |
|---|---|
| Near Watercut Road (minor road) intersection with A737 North Ayrshire · 19 collisions | 9.2 |
| A761 to B787 Renfrewshire · 16 collisions | 7.8 |
Source:DfT STATS19,UK Motoring analysis 2021 to 2025 Updated
A further 6 collisions were recorded at junctions where the A737 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 A737
In route order. Each is the highway authority DfT files the count points under.
- Renfrewshire
- North Ayrshire
Roadworks on the A737 in Scotland
The Scottish Road Works Register lists 26 sets of roadworks on the A737 in Scotland, 4 of them under way. 23 close the road, a lane or a slip road. From the extract of 16 September 2026.
-
A737t St James Interchange To Linclive Interchange, Paisley
-
A737t Linclive Interchange To Barrochan Interchange, Linwood
-
A737t Barrochan Interchange To Kilbarchan Interchange, Johnstone
-
A737t Linclive Interchange To Barrochan Interchange, Linwood
-
A737t St James Interchange To Linclive Interchange, Paisley
-
A737t From Hillend Roundabout To Dalry Road, Dalgarven
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 | 15 count points in 2025 | 15 September 2026 |
| Reported collisions | Road safety open data (STATS19) Department for Transport Derived statistics UK Motoring | 2021 to 2025 | 73 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.