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CrashStats

B4391 accidents: crash map and statistics

Police recorded 242 collisions on the B4391 from 1979 to 2025, with 343 casualties. Of those crashes, 7 were fatal and 77 serious, and 7 people were killed.

In 2025 there was 1 collision on the B4391, down 67% from 3 in 2024, with 1 casualty.

Collisions since 1979
242
2,996th highest of 4,923 roads
Casualties
343
1.42 per collision
Fatal collisions
7
7 people killed
Serious collisions
77
94 seriously injured
Collisions in 2025
1
Down 67% on 2024
Casualties in 2025
1
Down 67% on 2024

Crash severity on the B4391

On the B4391, 2.9% of collisions were fatal and 32% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal72.9%
  • Serious7732%
  • Slight15865%

Where the B4391 ranks among 4,923 roads

Most collisions
2,996th
Most casualties
2,937th
Most fatal collisions
2,103rd
Most serious collisions
2,343rd

B4391 accidents by year

Collisions on the B4391 peaked at 13 in 2007 and were down to 1 in 2025.

Collisions and casualties on the B4391, 1979 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202433
202379
20221015
202134
202038
201946
2018710
201745
201646
201544
201433
2013310
201279
201157
201056
200956
200834
20071315
200688
2005813
2004914
200344
2002713
2001710
200059
199957
199857
199777
199647
199578
199434
199334
199258
199147
199079
198968
198868
198779
198634
198534
198435
198323
1982812
198122
198047
1979611

When crashes happen on the B4391

Sunday has the most collisions on the B4391 (64), and 3pm to 6pm is the busiest time of day (71).

Collisions by day of the week

  • Monday24 (9.9%)
  • Tuesday18 (7.4%)
  • Wednesday27 (11%)
  • Thursday33 (14%)
  • Friday38 (16%)
  • Saturday38 (16%)
  • Sunday64 (26%)

Collisions by time of day

  • Midnight to 3am10 (4.1%)
  • 3am to 6am2 (0.8%)
  • 6am to 9am11 (4.5%)
  • 9am to noon35 (14%)
  • Noon to 3pm55 (23%)
  • 3pm to 6pm71 (29%)
  • 6pm to 9pm38 (16%)
  • 9pm to midnight20 (8.3%)

Collisions by month

  • January14 (5.8%)
  • February9 (3.7%)
  • March17 (7%)
  • April20 (8.3%)
  • May19 (7.9%)
  • June23 (9.5%)
  • July36 (15%)
  • August34 (14%)
  • September31 (13%)
  • October22 (9.1%)
  • November11 (4.5%)
  • December6 (2.5%)

Light conditions at the time

  • Daylight190 (79%)
  • Dark, no street lighting47 (19%)
  • Dark, street lights lit5 (2.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4391 crashes

On the B4391, 84% of collisions happened where the speed limit was 60 mph and 63% on a dry road surface.

Speed limit at the scene

  • 30 mph30 (12%)
  • 40 mph2 (0.8%)
  • 60 mph204 (84%)
  • 70 mph6 (2.5%)

Weather at the time

  • Fine, no high winds181 (75%)
  • Raining, no high winds42 (17%)
  • Raining with high winds6 (2.5%)
  • Snowing, no high winds6 (2.5%)
  • Other4 (1.7%)
  • Not recorded3 (1.2%)

Road surface

  • Dry153 (63%)
  • Wet or damp78 (32%)
  • Frost or ice6 (2.5%)
  • Snow5 (2.1%)

Type of road

  • Single carriageway241 (100%)
  • Not recorded1 (0.4%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4391 crashes

Car occupants make up 65% of the people killed or injured on the B4391, followed by motorcyclists (23%).

Casualties by road user

  • Car occupant224 (65%)
  • Motorcyclist78 (23%)
  • Van occupant11 (3.2%)
  • Pedestrian9 (2.6%)
  • Cyclist8 (2.3%)
  • Goods vehicle occupant (over 3.5 tonnes)4 (1.2%)
  • Bus or coach occupant3 (0.9%)
  • Other6 (1.7%)

Vehicles involved

  • Car231 (64%)
  • Motorcycle79 (22%)
  • Van or goods vehicle up to 3.5 tonnes17 (4.7%)
  • Goods vehicle over 3.5 tonnes11 (3%)
  • Pedal cycle8 (2.2%)
  • Bus or coach5 (1.4%)
  • Other vehicle5 (1.4%)
  • Other5 (1.4%)

Casualties by age

  • 0 to 56 (1.7%)
  • 6 to 104 (1.2%)
  • 11 to 1512 (3.5%)
  • 16 to 2064 (19%)
  • 21 to 2547 (14%)
  • 26 to 3545 (13%)
  • 36 to 4554 (16%)
  • 46 to 5542 (12%)
  • 56 to 6541 (12%)
  • 66 to 7524 (7%)
  • Over 754 (1.2%)

Drivers, passengers and pedestrians

  • Driver or rider237 (69%)
  • Passenger97 (28%)
  • Pedestrian9 (2.6%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4391

Map of the 25 most recent crashes on the B4391

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4391 crashes by council area

Collisions on the B4391 were recorded in 3 council areas. Gwynedd has the most, with 141, followed by Powys (94) and Denbighshire (7).

Collisions on the B4391 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stGwynedd141199343
2ndPowys94126430
3rdDenbighshire71804

B4391 crashes by town

Of the 242 collisions on the B4391, 8 were in the built-up area of Y Bala.

Recent crashes on the B4391

These are the 25 most recent collisions on the B4391, from 9 September 2020 to 28 August 2025.

Severity