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CrashStats

UB9 road accidents: crash map and statistics

Police recorded 3,041 road traffic collisions in the UB9 postcode district, Buckinghamshire, from 1979 to 2025, and 4,205 people were killed or injured in them. Of those collisions, 57 were fatal and 581 were serious.

In 2025 police recorded 25 collisions, down 17% on 2024 (30).

Collisions since 1979
3,041
1,304th highest of 2,813 postcode districts
Casualties
4,205
1.38 per collision
Fatal collisions
57
59 people killed
Serious collisions
581
702 seriously injured
Collisions in 2025
25
Down 17% on 2024
Casualties in 2025
35
Level with 2024

Road collision statistics for UB9

Collisions by severity, 1979 to 2025

  • Fatal571.9%
  • Serious58119%
  • Slight2,40379%

What the data shows

  • UB9 had 331 collisions from 2016 to 2025, 38% fewer than the 535 from 2006 to 2015.
  • 21% of collisions in UB9 were fatal or serious, against 20% across Great Britain.
  • 349 children under 16 were killed or injured in UB9, 8.6% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 31% of collisions in UB9.

Where UB9 ranks among 2,813 postcode districts

Most collisions
1,304th
Most casualties
1,245th
Most fatal collisions
1,003rd
Most serious collisions
1,260th

Collisions by day of the week

  • Monday440 (14%)
  • Tuesday408 (13%)
  • Wednesday503 (17%)
  • Thursday443 (15%)
  • Friday499 (16%)
  • Saturday431 (14%)
  • Sunday317 (10%)

Light conditions

  • Daylight2,058 (68%)
  • Dark, street lights lit749 (25%)
  • Dark, no street lighting171 (5.6%)
  • Dark, lighting unknown36 (1.2%)
  • Dark, street lights unlit25 (0.8%)
  • Not recorded2 (0.1%)

Type of road

  • Single carriageway1,833 (60%)
  • Dual carriageway825 (27%)
  • Roundabout283 (9.3%)
  • One way street or slip road87 (2.9%)
  • Not recorded13 (0.4%)

Speed limit at the scene

  • 20 mph14 (0.5%)
  • 30 mph1,072 (35%)
  • 40 mph368 (12%)
  • 50 mph181 (6%)
  • 60 mph763 (25%)
  • 70 mph642 (21%)
  • Not recorded1 (under 0.1%)

Weather at the time

  • Fine, no high winds2,449 (81%)
  • Raining, no high winds354 (12%)
  • Fine with high winds33 (1.1%)
  • Raining with high winds31 (1%)
  • Fog or mist29 (1%)
  • Snowing, no high winds12 (0.4%)
  • Snowing with high winds2 (0.1%)
  • Other76 (2.5%)
  • Not recorded55 (1.8%)

Who was hurt

  • Car occupant3,008 (72%)
  • Motorcyclist452 (11%)
  • Pedestrian270 (6.4%)
  • Cyclist196 (4.7%)
  • Van occupant163 (3.9%)
  • Goods vehicle occupant (over 3.5 tonnes)47 (1.1%)
  • Bus or coach occupant24 (0.6%)
  • Minibus occupant18 (0.4%)
  • Taxi or private hire car occupant15 (0.4%)
  • Other vehicle occupant11 (0.3%)
  • Other1 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

UB9 road accidents by year

Collisions and casualties in UB9, 1979 to 2025

Collisions in UB9 peaked at 98 in 1992; 2025 had 25.

  • Collisions
  • Collisions in 2025: 25
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252535
20243035
20232635
20223239
20213239
20202832
20193950
20184455
20173648
20163950
20154358
20143659
20134054
20125875
20115677
20106487
20095779
200871103
20075378
20065792
200567103
200492128
20037395
200288124
200185124
200074108
199995157
199885116
199787127
199680103
199584125
199474103
199382107
199298156
199182121
199080101
19897294
198892127
19876997
19867298
198593131
198488117
198389112
198295120
19817897
19803643
19796591

Map of recent crashes in UB9

Map of the 24 most recent crashes in UB9

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in UB9

The 24 most recent collisions in UB9 happened between 13 January and 17 December 2025.

Severity

Crashes by road in UB9

The A40 has the most collisions in UB9, 894 of 3,041 (29%), followed by the A412 (365).

Collisions in UB9 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA408941,29914159
2ndA4123654831289
3rdM40234352530
4thA4020196258344
5thA41391203
6thA40103300

Council areas covering UB9

Collisions in UB9 were recorded in 3 council areas. Buckinghamshire has 1,925 of 3,041 (63%).

Collisions in UB9 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stBuckinghamshire1,9252,69235361
2ndHillingdon1,0821,45920213
3rdThree Rivers284826

Towns in UB9

Collisions in UB9 were recorded in 3 towns, led by Hillingdon (574) and New Denham (178).