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CrashStats

B521 accidents: crash map and statistics

Police recorded 171 collisions on the B521 from 1979 to 2024, with 188 casualties. Of those crashes, none were fatal and 18 were serious.

No collisions were recorded on the B521 in 2025, after 1 in 2024.

Collisions since 1979
171
3,439th highest of 4,923 roads
Casualties
188
1.10 per collision
Fatal collisions
0
No one killed
Serious collisions
18
18 seriously injured
Collisions in 2025
0
1 in 2024
Casualties in 2025
0
1 in 2024

Crash severity on the B521

None of the 171 collisions on the B521 were fatal, and 11% were serious (18% across Great Britain).

Collisions by severity, 1979 to 2024

  • Fatal00%
  • Serious1811%
  • Slight15389%

Where the B521 ranks among 4,923 roads

Most collisions
3,439th
Most casualties
3,688th
Most fatal collisions
4,444th
Most serious collisions
4,133rd

B521 accidents by year

Collisions on the B521 peaked at 13 in 1988; none were recorded in 2025.

Collisions and casualties on the B521, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202500
202411
202300
202211
202100
202000
201911
201811
201711
201600
201511
201411
201334
201211
201100
201033
200922
200822
200711
200622
200511
200433
200335
200233
200168
200056
1999913
19981112
199711
199622
19951010
199444
199333
199278
199177
199044
198955
19881314
1987910
198667
19851010
198456
198366
198277
198144
198033
197934

When crashes happen on the B521

Thursday has the most collisions on the B521 (37), and noon to 3pm is the busiest time of day (53).

Collisions by day of the week

  • Monday29 (17%)
  • Tuesday25 (15%)
  • Wednesday36 (21%)
  • Thursday37 (22%)
  • Friday28 (16%)
  • Saturday11 (6.4%)
  • Sunday5 (2.9%)

Collisions by time of day

  • Midnight to 3am4 (2.3%)
  • 3am to 6am4 (2.3%)
  • 6am to 9am19 (11%)
  • 9am to noon38 (22%)
  • Noon to 3pm53 (31%)
  • 3pm to 6pm38 (22%)
  • 6pm to 9pm9 (5.3%)
  • 9pm to midnight6 (3.5%)

Collisions by month

  • January18 (11%)
  • February12 (7%)
  • March17 (9.9%)
  • April13 (7.6%)
  • May12 (7%)
  • June12 (7%)
  • July13 (7.6%)
  • August15 (8.8%)
  • September15 (8.8%)
  • October14 (8.2%)
  • November14 (8.2%)
  • December16 (9.4%)

Light conditions at the time

  • Daylight138 (81%)
  • Dark, street lights lit33 (19%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B521 crashes

On the B521, 98% of collisions happened where the speed limit was 30 mph and 77% on a dry road surface.

Speed limit at the scene

  • 20 mph4 (2.3%)
  • 30 mph167 (98%)

Weather at the time

  • Fine, no high winds132 (77%)
  • Raining, no high winds20 (12%)
  • Fine with high winds1 (0.6%)
  • Snowing, no high winds1 (0.6%)
  • Other11 (6.4%)
  • Not recorded6 (3.5%)

Road surface

  • Dry132 (77%)
  • Wet or damp39 (23%)

Type of road

  • Single carriageway145 (85%)
  • Roundabout6 (3.5%)
  • Dual carriageway3 (1.8%)
  • One way street or slip road3 (1.8%)
  • Not recorded14 (8.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B521 crashes

Pedestrians make up 44% of the people killed or injured on the B521, followed by motorcyclists (23%).

Casualties by road user

  • Pedestrian83 (44%)
  • Motorcyclist44 (23%)
  • Car occupant34 (18%)
  • Cyclist20 (11%)
  • Taxi or private hire car occupant3 (1.6%)
  • Bus or coach occupant2 (1.1%)
  • Goods vehicle occupant (over 3.5 tonnes)1 (0.5%)
  • Van occupant1 (0.5%)

Vehicles involved

  • Car140 (53%)
  • Motorcycle58 (22%)
  • Van or goods vehicle up to 3.5 tonnes25 (9.4%)
  • Pedal cycle20 (7.5%)
  • Taxi or private hire car11 (4.2%)
  • Goods vehicle over 3.5 tonnes6 (2.3%)
  • Other vehicle3 (1.1%)
  • Bus or coach2 (0.8%)

Casualties by age

  • 0 to 51 (0.5%)
  • 6 to 103 (1.6%)
  • 11 to 151 (0.5%)
  • 16 to 2022 (12%)
  • 21 to 2531 (16%)
  • 26 to 3560 (32%)
  • 36 to 4515 (8%)
  • 46 to 5518 (9.6%)
  • 56 to 656 (3.2%)
  • 66 to 755 (2.7%)
  • Over 752 (1.1%)
  • Not recorded24 (13%)

Drivers, passengers and pedestrians

  • Driver or rider88 (47%)
  • Pedestrian83 (44%)
  • Passenger17 (9%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B521

Map of the 25 most recent crashes on the B521

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

  • 25 crashes
  • Serious
  • Slight

B521 crashes by council area

Collisions on the B521 were recorded in 3 council areas. Camden has the most, with 151, followed by City of London (14) and Manchester (5).

Collisions on the B521 in each area, 1979 to 2024
RankAreaCollisionsCasualtiesFatalSerious
1stCamden151161017
2ndCity of London141501
3rdManchester5900

B521 crashes by town

Collisions on the B521 were recorded in 2 towns and built-up areas, led by Camden (149) and Manchester (4).

Recent crashes on the B521

These are the 25 most recent collisions on the B521, from 23 March 2004 to 15 April 2024.

Severity