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CrashStats

A4086 accidents: crash map and statistics

Police recorded 651 collisions on the A4086 from 1979 to 2025, with 991 casualties. Of those crashes, 13 were fatal and 156 serious, and 15 people were killed.

In 2025 there were 5 collisions on the A4086, up 150% from 2 in 2024, with 6 casualties.

Collisions since 1979
651
1,591st highest of 4,923 roads
Casualties
991
1.52 per collision
Fatal collisions
13
15 people killed
Serious collisions
156
193 seriously injured
Collisions in 2025
5
Up 150% on 2024
Casualties in 2025
6
Up 100% on 2024

Crash severity on the A4086

On the A4086, 2% of collisions were fatal and 24% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal132%
  • Serious15624%
  • Slight48274%

Where the A4086 ranks among 4,923 roads

Most collisions
1,591st
Most casualties
1,445th
Most fatal collisions
1,413th
Most serious collisions
1,331st

A4086 accidents by year

Collisions on the A4086 peaked at 30 in 1981 and were down to 5 in 2025.

Collisions and casualties on the A4086, 1979 to 2025

  • Collisions
  • Collisions in 2025: 5
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202556
202423
202366
202233
202133
202033
201966
2018910
2017813
2016911
20151414
20141213
20131113
20121316
20111017
20101018
20091523
20081421
2007713
20062127
20051525
200444
2003917
20021324
20011427
2000914
19991215
19982131
19971936
19961925
19951724
19942338
19932346
19921424
19912532
19901525
19891537
19881217
19871829
19861124
19851723
19842845
19831722
19821830
19813038
19802952
19792328

When crashes happen on the A4086

Friday has the most collisions on the A4086 (124), and 3pm to 6pm is the busiest time of day (167).

Collisions by day of the week

  • Monday69 (11%)
  • Tuesday79 (12%)
  • Wednesday95 (15%)
  • Thursday80 (12%)
  • Friday124 (19%)
  • Saturday106 (16%)
  • Sunday98 (15%)

Collisions by time of day

  • Midnight to 3am22 (3.4%)
  • 3am to 6am4 (0.6%)
  • 6am to 9am64 (9.8%)
  • 9am to noon97 (15%)
  • Noon to 3pm143 (22%)
  • 3pm to 6pm167 (26%)
  • 6pm to 9pm94 (14%)
  • 9pm to midnight60 (9.2%)

Collisions by month

  • January42 (6.5%)
  • February38 (5.8%)
  • March40 (6.1%)
  • April45 (6.9%)
  • May66 (10%)
  • June55 (8.4%)
  • July76 (12%)
  • August76 (12%)
  • September68 (10%)
  • October51 (7.8%)
  • November53 (8.1%)
  • December41 (6.3%)

Light conditions at the time

  • Daylight499 (77%)
  • Dark, no street lighting76 (12%)
  • Dark, street lights lit66 (10%)
  • Dark, lighting unknown5 (0.8%)
  • Dark, street lights unlit5 (0.8%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4086 crashes

On the A4086, 54% of collisions happened where the speed limit was 60 mph and 51% on a dry road surface.

Speed limit at the scene

  • 20 mph1 (0.2%)
  • 30 mph195 (30%)
  • 40 mph44 (6.8%)
  • 50 mph23 (3.5%)
  • 60 mph354 (54%)
  • 70 mph34 (5.2%)

Weather at the time

  • Fine, no high winds430 (66%)
  • Raining, no high winds130 (20%)
  • Raining with high winds30 (4.6%)
  • Fine with high winds18 (2.8%)
  • Other39 (6%)
  • Not recorded4 (0.6%)

Road surface

  • Dry334 (51%)
  • Wet or damp301 (46%)
  • Frost or ice11 (1.7%)
  • Flood over 3cm deep3 (0.5%)
  • Snow2 (0.3%)

Type of road

  • Single carriageway612 (94%)
  • Roundabout26 (4%)
  • One way street or slip road9 (1.4%)
  • Dual carriageway4 (0.6%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4086 crashes

Car occupants make up 68% of the people killed or injured on the A4086, followed by motorcyclists (10%).

Casualties by road user

  • Car occupant677 (68%)
  • Motorcyclist99 (10%)
  • Pedestrian85 (8.6%)
  • Cyclist41 (4.1%)
  • Minibus occupant41 (4.1%)
  • Van occupant25 (2.5%)
  • Other22 (2.2%)
  • Not recorded1 (0.1%)

Vehicles involved

  • Car859 (77%)
  • Motorcycle94 (8.4%)
  • Pedal cycle42 (3.8%)
  • Van or goods vehicle up to 3.5 tonnes37 (3.3%)
  • Minibus20 (1.8%)
  • Bus or coach19 (1.7%)
  • Goods vehicle over 3.5 tonnes19 (1.7%)
  • Other23 (2.1%)

Casualties by age

  • 0 to 523 (2.3%)
  • 6 to 1045 (4.5%)
  • 11 to 1555 (5.5%)
  • 16 to 20161 (16%)
  • 21 to 25158 (16%)
  • 26 to 35176 (18%)
  • 36 to 45127 (13%)
  • 46 to 55108 (11%)
  • 56 to 6567 (6.8%)
  • 66 to 7542 (4.2%)
  • Over 7528 (2.8%)
  • Not recorded1 (0.1%)

Drivers, passengers and pedestrians

  • Driver or rider555 (56%)
  • Passenger351 (35%)
  • Pedestrian85 (8.6%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4086

Map of the 25 most recent crashes on the A4086

Use the arrow keys to move the map and the plus and minus keys to zoom.

  • 25 crashes
  • Fatal
  • Serious
  • Slight

A4086 crashes by council area

Collisions on the A4086 were recorded in 2 council areas. Gwynedd has the most, with 605, followed by Conwy (45).

Collisions on the A4086 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stGwynedd60591513147
2ndConwy457509

A4086 crashes by town

Of the 651 collisions on the A4086, 99 were in the built-up area of Caernarfon.

Recent crashes on the A4086

These are the 25 most recent collisions on the A4086, from 21 July 2019 to 9 August 2025.

Severity