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CrashStats

B4337 accidents: crash map and statistics

Police recorded 405 collisions on the B4337 from 1979 to 2025, with 573 casualties. Of those crashes, 4 were fatal and 114 serious, and 4 people were killed.

In 2025 there were 9 collisions on the B4337, down 10% from 10 in 2024, with 11 casualties.

Collisions since 1979
405
2,290th highest of 4,923 roads
Casualties
573
1.41 per collision
Fatal collisions
4
4 people killed
Serious collisions
114
134 seriously injured
Collisions in 2025
9
Down 10% on 2024
Casualties in 2025
11
Level with 2024

Crash severity on the B4337

On the B4337, 1% of collisions were fatal and 28% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal41%
  • Serious11428%
  • Slight28771%

Where the B4337 ranks among 4,923 roads

Most collisions
2,290th
Most casualties
2,220th
Most fatal collisions
2,815th
Most serious collisions
1,708th

B4337 accidents by year

Collisions on the B4337 peaked at 19 in 2002 and were down to 9 in 2025.

Collisions and casualties on the B4337, 1979 to 2025

  • Collisions
  • Collisions in 2025: 9
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025911
20241011
2023811
202266
202189
2020610
20191212
20181520
20171119
201689
201569
201466
201333
20121215
201169
201035
20091115
2008911
20071218
20061422
20051115
20041218
200344
20021930
2001913
20001727
1999613
199856
1997813
19961022
19951116
19941112
199368
1992812
1991711
1990912
198966
1988712
1987811
198647
198566
198479
1983811
1982715
19811014
1980813
197966

When crashes happen on the B4337

Friday has the most collisions on the B4337 (65), and 3pm to 6pm is the busiest time of day (96).

Collisions by day of the week

  • Monday53 (13%)
  • Tuesday64 (16%)
  • Wednesday50 (12%)
  • Thursday59 (15%)
  • Friday65 (16%)
  • Saturday53 (13%)
  • Sunday61 (15%)

Collisions by time of day

  • Midnight to 3am15 (3.7%)
  • 3am to 6am8 (2%)
  • 6am to 9am47 (12%)
  • 9am to noon73 (18%)
  • Noon to 3pm78 (19%)
  • 3pm to 6pm96 (24%)
  • 6pm to 9pm65 (16%)
  • 9pm to midnight23 (5.7%)

Collisions by month

  • January30 (7.4%)
  • February29 (7.2%)
  • March33 (8.1%)
  • April25 (6.2%)
  • May27 (6.7%)
  • June32 (7.9%)
  • July40 (9.9%)
  • August43 (11%)
  • September40 (9.9%)
  • October33 (8.1%)
  • November43 (11%)
  • December30 (7.4%)

Light conditions at the time

  • Daylight311 (77%)
  • Dark, no street lighting77 (19%)
  • Dark, street lights lit15 (3.7%)
  • Dark, lighting unknown2 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4337 crashes

On the B4337, 81% of collisions happened where the speed limit was 60 mph and 50% on a wet or damp road surface.

Speed limit at the scene

  • 20 mph2 (0.5%)
  • 30 mph51 (13%)
  • 40 mph21 (5.2%)
  • 50 mph3 (0.7%)
  • 60 mph328 (81%)

Weather at the time

  • Fine, no high winds274 (68%)
  • Raining, no high winds86 (21%)
  • Raining with high winds10 (2.5%)
  • Fog or mist8 (2%)
  • Other26 (6.4%)
  • Not recorded1 (0.2%)

Road surface

  • Wet or damp202 (50%)
  • Dry193 (48%)
  • Frost or ice7 (1.7%)
  • Snow3 (0.7%)

Type of road

  • Single carriageway402 (99%)
  • One way street or slip road2 (0.5%)
  • Dual carriageway1 (0.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4337 crashes

Car occupants make up 79% of the people killed or injured on the B4337, followed by motorcyclists (7.7%).

Casualties by road user

  • Car occupant452 (79%)
  • Motorcyclist44 (7.7%)
  • Van occupant27 (4.7%)
  • Pedestrian24 (4.2%)
  • Cyclist8 (1.4%)
  • Agricultural vehicle occupant5 (0.9%)
  • Bus or coach occupant4 (0.7%)
  • Other9 (1.6%)

Vehicles involved

  • Car524 (75%)
  • Van or goods vehicle up to 3.5 tonnes54 (7.7%)
  • Motorcycle43 (6.1%)
  • Goods vehicle over 3.5 tonnes32 (4.6%)
  • Other vehicle13 (1.9%)
  • Agricultural vehicle11 (1.6%)
  • Other24 (3.4%)
  • Not recorded1 (0.1%)

Casualties by age

  • 0 to 58 (1.4%)
  • 6 to 1021 (3.7%)
  • 11 to 1523 (4%)
  • 16 to 20100 (17%)
  • 21 to 2581 (14%)
  • 26 to 35108 (19%)
  • 36 to 4592 (16%)
  • 46 to 5562 (11%)
  • 56 to 6537 (6.5%)
  • 66 to 7527 (4.7%)
  • Over 7513 (2.3%)
  • Not recorded1 (0.2%)

Drivers, passengers and pedestrians

  • Driver or rider375 (65%)
  • Passenger174 (30%)
  • Pedestrian24 (4.2%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4337

Map of the 25 most recent crashes on the B4337

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

  • 25 crashes
  • Serious
  • Slight

B4337 crashes by council area

Collisions on the B4337 were recorded in 2 council areas. Ceredigion has the most, with 347, followed by Carmarthenshire (58).

Collisions on the B4337 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCeredigion347498488
2ndCarmarthenshire5875026

Recent crashes on the B4337

These are the 25 most recent collisions on the B4337, from 28 April 2023 to 7 November 2025.

Severity