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CrashStats

B4520 accidents: crash map and statistics

Police recorded 218 collisions on the B4520 from 1979 to 2025, with 289 casualties. Of those crashes, 6 were fatal and 67 serious, and 7 people were killed.

In 2025 there were 2 collisions on the B4520, down 75% from 8 in 2024, with 2 casualties.

Collisions since 1979
218
3,134th highest of 4,923 roads
Casualties
289
1.33 per collision
Fatal collisions
6
7 people killed
Serious collisions
67
80 seriously injured
Collisions in 2025
2
Down 75% on 2024
Casualties in 2025
2
Down 78% on 2024

Crash severity on the B4520

On the B4520, 2.8% of collisions were fatal and 31% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal62.8%
  • Serious6731%
  • Slight14567%

Where the B4520 ranks among 4,923 roads

Most collisions
3,134th
Most casualties
3,172nd
Most fatal collisions
2,299th
Most serious collisions
2,538th

B4520 accidents by year

Collisions on the B4520 peaked at 8 in 2024 and were down to 2 in 2025.

Collisions and casualties on the B4520, 1979 to 2025

  • Collisions
  • Collisions in 2025: 2
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202522
202489
202358
202200
202156
202044
201968
201888
201722
201646
201535
201455
201367
201223
201133
2010611
200948
200858
200778
200679
200559
200468
200357
200237
200157
200077
199911
199800
199755
199656
199545
1994810
199345
199266
199145
199056
1989712
198868
198758
1986511
198557
198466
198333
198244
198169
198045
197922

When crashes happen on the B4520

Friday has the most collisions on the B4520 (46), and noon to 3pm is the busiest time of day (56).

Collisions by day of the week

  • Monday34 (16%)
  • Tuesday22 (10%)
  • Wednesday28 (13%)
  • Thursday26 (12%)
  • Friday46 (21%)
  • Saturday36 (17%)
  • Sunday26 (12%)

Collisions by time of day

  • Midnight to 3am7 (3.2%)
  • 3am to 6am3 (1.4%)
  • 6am to 9am18 (8.3%)
  • 9am to noon43 (20%)
  • Noon to 3pm56 (26%)
  • 3pm to 6pm49 (22%)
  • 6pm to 9pm28 (13%)
  • 9pm to midnight14 (6.4%)

Collisions by month

  • January10 (4.6%)
  • February17 (7.8%)
  • March29 (13%)
  • April10 (4.6%)
  • May20 (9.2%)
  • June17 (7.8%)
  • July25 (11%)
  • August25 (11%)
  • September16 (7.3%)
  • October21 (9.6%)
  • November18 (8.3%)
  • December10 (4.6%)

Light conditions at the time

  • Daylight176 (81%)
  • Dark, no street lighting30 (14%)
  • Dark, street lights lit10 (4.6%)
  • Dark, lighting unknown1 (0.5%)
  • Not recorded1 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4520 crashes

On the B4520, 69% of collisions happened where the speed limit was 60 mph and 60% on a dry road surface.

Speed limit at the scene

  • 30 mph62 (28%)
  • 40 mph5 (2.3%)
  • 60 mph150 (69%)
  • 70 mph1 (0.5%)

Weather at the time

  • Fine, no high winds160 (73%)
  • Raining, no high winds30 (14%)
  • Raining with high winds9 (4.1%)
  • Fine with high winds5 (2.3%)
  • Other12 (5.5%)
  • Not recorded2 (0.9%)

Road surface

  • Dry131 (60%)
  • Wet or damp76 (35%)
  • Frost or ice9 (4.1%)
  • Snow1 (0.5%)
  • Not recorded1 (0.5%)

Type of road

  • Single carriageway211 (97%)
  • One way street or slip road6 (2.8%)
  • Dual carriageway1 (0.5%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4520 crashes

Car occupants make up 58% of the people killed or injured on the B4520, followed by motorcyclists (19%).

Casualties by road user

  • Car occupant167 (58%)
  • Motorcyclist54 (19%)
  • Pedestrian30 (10%)
  • Van occupant16 (5.5%)
  • Cyclist8 (2.8%)
  • Other vehicle occupant7 (2.4%)
  • Goods vehicle occupant (over 3.5 tonnes)4 (1.4%)
  • Other3 (1%)

Vehicles involved

  • Car205 (61%)
  • Motorcycle63 (19%)
  • Van or goods vehicle up to 3.5 tonnes23 (6.9%)
  • Goods vehicle over 3.5 tonnes17 (5.1%)
  • Other vehicle11 (3.3%)
  • Pedal cycle8 (2.4%)
  • Minibus3 (0.9%)
  • Other5 (1.5%)

Casualties by age

  • 0 to 53 (1%)
  • 6 to 1015 (5.2%)
  • 11 to 1517 (5.9%)
  • 16 to 2054 (19%)
  • 21 to 2546 (16%)
  • 26 to 3549 (17%)
  • 36 to 4533 (11%)
  • 46 to 5528 (9.7%)
  • 56 to 6522 (7.6%)
  • 66 to 7511 (3.8%)
  • Over 7511 (3.8%)

Drivers, passengers and pedestrians

  • Driver or rider192 (66%)
  • Passenger67 (23%)
  • Pedestrian30 (10%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4520

Map of the 25 most recent crashes on the B4520

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4520 crashes by council area

Of the 218 collisions on the B4520, 215 were in Powys.

Collisions on the B4520 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stPowys215284666

B4520 crashes by town

Collisions on the B4520 were recorded in 2 towns and built-up areas, led by Brecon (47) and Builth Wells (7).

Recent crashes on the B4520

These are the 25 most recent collisions on the B4520, from 31 August 2019 to 26 November 2025.

Severity