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CrashStats

B4239 accidents: crash map and statistics

Police recorded 339 collisions on the B4239 from 1979 to 2025, with 501 casualties. Of those crashes, 7 were fatal and 77 serious, and 10 people were killed.

In 2025 there were 6 collisions on the B4239, up 200% from 2 in 2024, with 10 casualties.

Collisions since 1979
339
2,531st highest of 4,923 roads
Casualties
501
1.48 per collision
Fatal collisions
7
10 people killed
Serious collisions
77
91 seriously injured
Collisions in 2025
6
Up 200% on 2024
Casualties in 2025
10
Up 400% on 2024

Crash severity on the B4239

On the B4239, 2.1% of collisions were fatal and 23% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal72.1%
  • Serious7723%
  • Slight25575%

Where the B4239 ranks among 4,923 roads

Most collisions
2,531st
Most casualties
2,414th
Most fatal collisions
2,103rd
Most serious collisions
2,343rd

B4239 accidents by year

Collisions on the B4239 peaked at 17 in 1990 and were down to 6 in 2025.

Collisions and casualties on the B4239, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025610
202422
202333
202277
2021711
202034
201967
2018610
201745
201635
20151014
2014810
20131015
201249
201145
201035
200944
200845
200769
2006710
2005611
2004611
20031014
200268
20011115
200067
1999310
1998810
199757
199645
1995915
19941222
199333
19921017
199179
19901724
19891015
1988916
1987913
1986813
1985912
1984917
19831013
19821216
198177
19801120
19791521

When crashes happen on the B4239

Tuesday has the most collisions on the B4239 (52), and 3pm to 6pm is the busiest time of day (94).

Collisions by day of the week

  • Monday44 (13%)
  • Tuesday52 (15%)
  • Wednesday49 (14%)
  • Thursday47 (14%)
  • Friday52 (15%)
  • Saturday48 (14%)
  • Sunday47 (14%)

Collisions by time of day

  • Midnight to 3am12 (3.5%)
  • 3am to 6am3 (0.9%)
  • 6am to 9am27 (8%)
  • 9am to noon45 (13%)
  • Noon to 3pm64 (19%)
  • 3pm to 6pm94 (28%)
  • 6pm to 9pm55 (16%)
  • 9pm to midnight39 (12%)

Collisions by month

  • January35 (10%)
  • February28 (8.3%)
  • March29 (8.6%)
  • April28 (8.3%)
  • May29 (8.6%)
  • June26 (7.7%)
  • July32 (9.4%)
  • August27 (8%)
  • September29 (8.6%)
  • October28 (8.3%)
  • November26 (7.7%)
  • December22 (6.5%)

Light conditions at the time

  • Daylight255 (75%)
  • Dark, no street lighting37 (11%)
  • Dark, street lights lit35 (10%)
  • Dark, lighting unknown9 (2.7%)
  • Dark, street lights unlit3 (0.9%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4239 crashes

On the B4239, 59% of collisions happened where the speed limit was 30 mph and 68% on a dry road surface.

Speed limit at the scene

  • 20 mph3 (0.9%)
  • 30 mph199 (59%)
  • 40 mph11 (3.2%)
  • 50 mph12 (3.5%)
  • 60 mph112 (33%)
  • 70 mph2 (0.6%)

Weather at the time

  • Fine, no high winds273 (81%)
  • Raining, no high winds38 (11%)
  • Fine with high winds6 (1.8%)
  • Raining with high winds5 (1.5%)
  • Other12 (3.5%)
  • Not recorded5 (1.5%)

Road surface

  • Dry232 (68%)
  • Wet or damp99 (29%)
  • Frost or ice7 (2.1%)
  • Snow1 (0.3%)

Type of road

  • Single carriageway326 (96%)
  • Dual carriageway5 (1.5%)
  • Roundabout5 (1.5%)
  • Not recorded3 (0.9%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4239 crashes

Car occupants make up 63% of the people killed or injured on the B4239, followed by pedestrians (13%).

Casualties by road user

  • Car occupant316 (63%)
  • Pedestrian63 (13%)
  • Motorcyclist49 (9.8%)
  • Cyclist35 (7%)
  • Van occupant14 (2.8%)
  • Minibus occupant8 (1.6%)
  • Taxi or private hire car occupant6 (1.2%)
  • Other10 (2%)

Vehicles involved

  • Car401 (73%)
  • Motorcycle45 (8.1%)
  • Pedal cycle35 (6.3%)
  • Van or goods vehicle up to 3.5 tonnes29 (5.2%)
  • Goods vehicle over 3.5 tonnes21 (3.8%)
  • Bus or coach9 (1.6%)
  • Other vehicle6 (1.1%)
  • Other7 (1.3%)

Casualties by age

  • 0 to 514 (2.8%)
  • 6 to 1015 (3%)
  • 11 to 1553 (11%)
  • 16 to 20115 (23%)
  • 21 to 2586 (17%)
  • 26 to 3592 (18%)
  • 36 to 4545 (9%)
  • 46 to 5552 (10%)
  • 56 to 6516 (3.2%)
  • 66 to 758 (1.6%)
  • Over 755 (1%)

Drivers, passengers and pedestrians

  • Driver or rider257 (51%)
  • Passenger181 (36%)
  • Pedestrian63 (13%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4239

Map of the 25 most recent crashes on the B4239

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

  • 25 crashes
  • Serious
  • Slight

B4239 crashes by council area

Collisions on the B4239 were recorded in 2 council areas. Newport has the most, with 216, followed by Cardiff (120).

Collisions on the B4239 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stNewport216330660
2ndCardiff120168116

B4239 crashes by town

Collisions on the B4239 were recorded in 2 towns and built-up areas, led by Cardiff (86) and Newport, Newport (44).

Recent crashes on the B4239

These are the 25 most recent collisions on the B4239, from 3 February 2021 to 20 October 2025.

Severity