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CrashStats

B4487 accidents: crash map and statistics

Police recorded 685 collisions on the B4487 from 1979 to 2025, with 898 casualties. Of those crashes, 15 were fatal and 96 serious, and 15 people were killed.

In 2025 there were 2 collisions on the B4487, down 75% from 8 in 2024, with 2 casualties.

Collisions since 1979
685
1,530th highest of 4,923 roads
Casualties
898
1.31 per collision
Fatal collisions
15
15 people killed
Serious collisions
96
111 seriously injured
Collisions in 2025
2
Down 75% on 2024
Casualties in 2025
2
Down 78% on 2024

Crash severity on the B4487

On the B4487, 2.2% of collisions were fatal and 14% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal152.2%
  • Serious9614%
  • Slight57484%

Where the B4487 ranks among 4,923 roads

Most collisions
1,530th
Most casualties
1,561st
Most fatal collisions
1,258th
Most serious collisions
1,982nd

B4487 accidents by year

Collisions on the B4487 peaked at 41 in 1990 and were down to 2 in 2025.

Collisions and casualties on the B4487, 1979 to 2025

  • Collisions
  • Collisions in 2025: 2
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202522
202489
202366
202255
20211010
202079
20191419
2018911
20171221
2016813
201555
20141314
20131321
201256
20111114
2010812
2009913
20081011
20072227
20062228
20051220
20041720
20031723
20021216
20012128
20001830
19991824
199868
1997910
199623
19951215
19941113
19931112
199269
19911214
19904159
19893455
19882735
19872430
19862934
19852731
19843846
19831419
19821819
19811318
19802433
19791318

When crashes happen on the B4487

Friday has the most collisions on the B4487 (121), and 3pm to 6pm is the busiest time of day (201).

Collisions by day of the week

  • Monday98 (14%)
  • Tuesday95 (14%)
  • Wednesday103 (15%)
  • Thursday107 (16%)
  • Friday121 (18%)
  • Saturday91 (13%)
  • Sunday70 (10%)

Collisions by time of day

  • Midnight to 3am16 (2.3%)
  • 3am to 6am6 (0.9%)
  • 6am to 9am55 (8%)
  • 9am to noon87 (13%)
  • Noon to 3pm125 (18%)
  • 3pm to 6pm201 (29%)
  • 6pm to 9pm117 (17%)
  • 9pm to midnight78 (11%)

Collisions by month

  • January59 (8.6%)
  • February48 (7%)
  • March53 (7.7%)
  • April64 (9.3%)
  • May54 (7.9%)
  • June48 (7%)
  • July54 (7.9%)
  • August51 (7.4%)
  • September59 (8.6%)
  • October51 (7.4%)
  • November64 (9.3%)
  • December80 (12%)

Light conditions at the time

  • Daylight477 (70%)
  • Dark, street lights lit192 (28%)
  • Dark, lighting unknown4 (0.6%)
  • Dark, street lights unlit4 (0.6%)
  • Dark, no street lighting3 (0.4%)
  • Not recorded5 (0.7%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4487 crashes

On the B4487, 75% of collisions happened where the speed limit was 30 mph and 69% on a dry road surface.

Speed limit at the scene

  • 20 mph15 (2.2%)
  • 30 mph515 (75%)
  • 40 mph151 (22%)
  • 50 mph2 (0.3%)
  • 70 mph2 (0.3%)

Weather at the time

  • Fine, no high winds551 (80%)
  • Raining, no high winds94 (14%)
  • Raining with high winds13 (1.9%)
  • Snowing, no high winds3 (0.4%)
  • Other8 (1.2%)
  • Not recorded16 (2.3%)

Road surface

  • Dry472 (69%)
  • Wet or damp204 (30%)
  • Frost or ice2 (0.3%)
  • Snow2 (0.3%)
  • Not recorded5 (0.7%)

Type of road

  • Single carriageway482 (70%)
  • Dual carriageway165 (24%)
  • Roundabout26 (3.8%)
  • One way street or slip road9 (1.3%)
  • Not recorded3 (0.4%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4487 crashes

Car occupants make up 56% of the people killed or injured on the B4487, followed by pedestrians (20%).

Casualties by road user

  • Car occupant500 (56%)
  • Pedestrian181 (20%)
  • Motorcyclist88 (9.8%)
  • Cyclist73 (8.1%)
  • Van occupant17 (1.9%)
  • Bus or coach occupant16 (1.8%)
  • Minibus occupant10 (1.1%)
  • Other13 (1.4%)

Vehicles involved

  • Car957 (77%)
  • Motorcycle88 (7.1%)
  • Pedal cycle75 (6%)
  • Van or goods vehicle up to 3.5 tonnes55 (4.4%)
  • Bus or coach24 (1.9%)
  • Taxi or private hire car17 (1.4%)
  • Goods vehicle over 3.5 tonnes15 (1.2%)
  • Other16 (1.3%)

Casualties by age

  • 0 to 517 (1.9%)
  • 6 to 1035 (3.9%)
  • 11 to 1563 (7%)
  • 16 to 20117 (13%)
  • 21 to 25143 (16%)
  • 26 to 35189 (21%)
  • 36 to 45124 (14%)
  • 46 to 5577 (8.6%)
  • 56 to 6573 (8.1%)
  • 66 to 7541 (4.6%)
  • Over 7518 (2%)
  • Not recorded1 (0.1%)

Drivers, passengers and pedestrians

  • Driver or rider495 (55%)
  • Passenger222 (25%)
  • Pedestrian181 (20%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4487

Map of the 25 most recent crashes on the B4487

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

  • 25 crashes
  • Serious
  • Slight

B4487 crashes by council area

Of the 685 collisions on the B4487, 681 were in Cardiff.

Collisions on the B4487 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCardiff6818921596

B4487 crashes by town

Of the 685 collisions on the B4487, 621 were in the built-up area of Cardiff.

Recent crashes on the B4487

These are the 25 most recent collisions on the B4487, from 15 September 2021 to 29 October 2025.

Severity