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CrashStats

HP21 road accidents: crash map and statistics

Police recorded 2,693 road traffic collisions in the HP21 postcode district, Buckinghamshire, from 1979 to 2025, and 3,288 people were killed or injured in them. Of those collisions, 16 were fatal and 361 were serious.

In 2025 police recorded 27 collisions, up 4% on 2024 (26).

Collisions since 1979
2,693
1,433rd of 2,813 postcode districts, highest first
Casualties
3,288
1.22 per collision
Fatal collisions
16
16 people killed
Serious collisions
361
390 seriously injured
Collisions in 2025
27
Up 4% on 2024
Casualties in 2025
30
Up 7% on 2024

Road collision statistics for HP21

Collisions by severity, 1979 to 2025

  • Fatal160.6%
  • Serious36113%
  • Slight2,31686%

What the data shows

  • HP21 had 299 collisions from 2016 to 2025, 37% fewer than the 478 from 2006 to 2015.
  • 14% of collisions in HP21 were fatal or serious, against 20% across Great Britain.
  • 624 children under 16 were killed or injured in HP21, 19% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 34% of collisions in HP21.

Where HP21 ranks among 2,813 postcode districts

Most collisions
1,433rd
Most casualties
1,559th
Most fatal collisions
2,259th
Most serious collisions
1,871st

Collisions by day of the week

  • Monday413 (15%)
  • Tuesday409 (15%)
  • Wednesday451 (17%)
  • Thursday404 (15%)
  • Friday461 (17%)
  • Saturday310 (12%)
  • Sunday245 (9.1%)

Light conditions

  • Daylight1,975 (73%)
  • Dark, street lights lit645 (24%)
  • Dark, lighting unknown42 (1.6%)
  • Dark, no street lighting14 (0.5%)
  • Dark, street lights unlit14 (0.5%)
  • Not recorded3 (0.1%)

Type of road

  • Single carriageway1,985 (74%)
  • Roundabout451 (17%)
  • Dual carriageway172 (6.4%)
  • One way street or slip road74 (2.7%)
  • Not recorded11 (0.4%)

Speed limit at the scene

  • 30 mph2,440 (91%)
  • 40 mph209 (7.8%)
  • 50 mph11 (0.4%)
  • 60 mph33 (1.2%)

Weather at the time

  • Fine, no high winds2,149 (80%)
  • Raining, no high winds332 (12%)
  • Fine with high winds46 (1.7%)
  • Raining with high winds27 (1%)
  • Fog or mist14 (0.5%)
  • Snowing, no high winds10 (0.4%)
  • Snowing with high winds3 (0.1%)
  • Other91 (3.4%)
  • Not recorded21 (0.8%)

Who was hurt

  • Car occupant1,635 (50%)
  • Pedestrian615 (19%)
  • Cyclist523 (16%)
  • Motorcyclist371 (11%)
  • Van occupant55 (1.7%)
  • Taxi or private hire car occupant35 (1.1%)
  • Bus or coach occupant24 (0.7%)
  • Goods vehicle occupant (over 3.5 tonnes)12 (0.4%)
  • Minibus occupant5 (0.2%)
  • Other vehicle occupant5 (0.2%)
  • Other2 (0.1%)
  • Not recorded6 (0.2%)

Source: Department for Transport, STATS19 road safety data

HP21 road accidents by year

Collisions and casualties in HP21, 1979 to 2025

Collisions in HP21 peaked at 96 in 1984; 2025 had 27.

  • Collisions
  • Collisions in 2025: 27
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252730
20242628
20233739
20222428
20213137
20202930
20193338
20182938
20172930
20163437
20153546
20145058
20134254
20123339
20114456
20104663
20096180
20086391
20075470
20065068
20056181
20046073
20036381
20027190
20016177
20006573
19995769
19986586
19977792
19967398
19956578
199476102
19935976
19926372
199184104
19908897
19898298
198881103
19877599
198684102
19855967
198496112
19838187
19827691
19817282
19804249
19798089

Map of recent crashes in HP21

Map of the 24 most recent crashes in HP21

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in HP21

The 24 most recent collisions in HP21 happened between 31 January and 11 December 2025.

Severity

Crashes by road in HP21

The A413 has the most collisions in HP21, 555 of 2,693 (21%), followed by the B4443 (395).

Collisions in HP21 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA413555656474
2ndB4443395510767
3rdA418214277023
4thA41186235020
5thA41563744013

Council area for HP21

HP21 is in Buckinghamshire, where police recorded 72,942 collisions from 1979 to 2025. HP21 accounts for 3.7% of them.

Town in HP21

Of the 2,693 collisions in HP21, 2,627 (98%) were in Aylesbury.