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CrashStats

B457 accidents: crash map and statistics

Police recorded 271 collisions on the B457 from 1979 to 2025, with 324 casualties. Of those crashes, 1 was fatal and 40 serious, and 1 person was killed.

In 2025 there were 4 collisions on the B457, up from none in 2024, with 4 casualties.

Collisions since 1979
271
2,852nd highest of 4,923 roads
Casualties
324
1.20 per collision
Fatal collisions
1
1 person killed
Serious collisions
40
40 seriously injured
Collisions in 2025
4
Up from none in 2024
Casualties in 2025
4
Up from none in 2024

Crash severity on the B457

On the B457, 0.4% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal10.4%
  • Serious4015%
  • Slight23085%

Where the B457 ranks among 4,923 roads

Most collisions
2,852nd
Most casualties
3,017th
Most fatal collisions
3,933rd
Most serious collisions
3,266th

B457 accidents by year

Collisions on the B457 peaked at 17 in 1998 and were down to 4 in 2025.

Collisions and casualties on the B457, 1979 to 2025

  • Collisions
  • Collisions in 2025: 4
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202544
202400
202300
202236
202166
202044
20191111
201867
201700
201688
201500
2014910
201348
201256
201144
201033
200900
200888
200778
200645
200577
20041011
20031113
2002812
20011011
20001217
19991319
19981720
1997810
19961316
19951416
19941012
19931722
1992910
19911214
199033
198944
198800
198722
198612
198522
198411
198300
198200
198100
198000
197912

When crashes happen on the B457

Friday has the most collisions on the B457 (57), and 3pm to 6pm is the busiest time of day (58).

Collisions by day of the week

  • Monday41 (15%)
  • Tuesday36 (13%)
  • Wednesday46 (17%)
  • Thursday36 (13%)
  • Friday57 (21%)
  • Saturday36 (13%)
  • Sunday19 (7%)

Collisions by time of day

  • Midnight to 3am11 (4.1%)
  • 3am to 6am4 (1.5%)
  • 6am to 9am27 (10%)
  • 9am to noon42 (15%)
  • Noon to 3pm55 (20%)
  • 3pm to 6pm58 (21%)
  • 6pm to 9pm48 (18%)
  • 9pm to midnight26 (9.6%)

Collisions by month

  • January20 (7.4%)
  • February22 (8.1%)
  • March17 (6.3%)
  • April23 (8.5%)
  • May20 (7.4%)
  • June22 (8.1%)
  • July29 (11%)
  • August18 (6.6%)
  • September25 (9.2%)
  • October26 (9.6%)
  • November22 (8.1%)
  • December27 (10%)

Light conditions at the time

  • Daylight180 (66%)
  • Dark, street lights lit84 (31%)
  • Dark, lighting unknown5 (1.8%)
  • Dark, no street lighting1 (0.4%)
  • Dark, street lights unlit1 (0.4%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B457 crashes

On the B457, 95% of collisions happened where the speed limit was 30 mph and 77% on a dry road surface.

Speed limit at the scene

  • 20 mph12 (4.4%)
  • 30 mph258 (95%)
  • 40 mph1 (0.4%)

Weather at the time

  • Fine, no high winds219 (81%)
  • Raining, no high winds32 (12%)
  • Raining with high winds4 (1.5%)
  • Snowing, no high winds2 (0.7%)
  • Other9 (3.3%)
  • Not recorded5 (1.8%)

Road surface

  • Dry209 (77%)
  • Wet or damp53 (20%)
  • Frost or ice3 (1.1%)
  • Snow2 (0.7%)
  • Not recorded4 (1.5%)

Type of road

  • Single carriageway232 (86%)
  • One way street or slip road18 (6.6%)
  • Dual carriageway9 (3.3%)
  • Roundabout6 (2.2%)
  • Not recorded6 (2.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B457 crashes

Car occupants make up 42% of the people killed or injured on the B457, followed by pedestrians (30%).

Casualties by road user

  • Car occupant135 (42%)
  • Pedestrian96 (30%)
  • Motorcyclist33 (10%)
  • Bus or coach occupant31 (9.6%)
  • Cyclist20 (6.2%)
  • Taxi or private hire car occupant7 (2.2%)
  • Van occupant2 (0.6%)

Vehicles involved

  • Car296 (70%)
  • Bus or coach49 (12%)
  • Motorcycle37 (8.7%)
  • Pedal cycle20 (4.7%)
  • Van or goods vehicle up to 3.5 tonnes17 (4%)
  • Taxi or private hire car5 (1.2%)
  • Goods vehicle over 3.5 tonnes1 (0.2%)

Casualties by age

  • 0 to 54 (1.2%)
  • 6 to 1013 (4%)
  • 11 to 1520 (6.2%)
  • 16 to 2039 (12%)
  • 21 to 2539 (12%)
  • 26 to 3554 (17%)
  • 36 to 4541 (13%)
  • 46 to 5530 (9.3%)
  • 56 to 6524 (7.4%)
  • 66 to 7511 (3.4%)
  • Over 7518 (5.6%)
  • Not recorded31 (9.6%)

Drivers, passengers and pedestrians

  • Driver or rider154 (48%)
  • Pedestrian96 (30%)
  • Passenger74 (23%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B457

Map of the 25 most recent crashes on the B457

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

  • 25 crashes
  • Serious
  • Slight

B457 crashes by council area

Of the 271 collisions on the B457, 269 were in Harrow.

Collisions on the B457 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stHarrow269321140

B457 crashes by town

Of the 271 collisions on the B457, 270 were in the built-up area of Harrow.

Recent crashes on the B457

These are the 25 most recent collisions on the B457, from 26 June 2019 to 26 May 2025.

Severity