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CrashStats

SN11 road accidents: crash map and statistics

Police recorded 2,091 road traffic collisions in the SN11 postcode district, Wiltshire, from 1979 to 2025, and 2,819 people were killed or injured in them. Of those collisions, 57 were fatal and 460 were serious.

In 2025 police recorded 38 collisions, up 27% on 2024 (30).

Collisions since 1979
2,091
1,715th of 2,813 postcode districts, highest first
Casualties
2,819
1.35 per collision
Fatal collisions
57
61 people killed
Serious collisions
460
527 seriously injured
Collisions in 2025
38
Up 27% on 2024
Casualties in 2025
48
Up 26% on 2024

Road collision statistics for SN11

Collisions by severity, 1979 to 2025

  • Fatal572.7%
  • Serious46022%
  • Slight1,57475%

What the data shows

  • SN11 had 320 collisions from 2016 to 2025, 7% more than the 300 from 2006 to 2015.
  • 25% of collisions in SN11 were fatal or serious, against 20% across Great Britain.
  • 327 children under 16 were killed or injured in SN11, 12% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 37% of collisions in SN11.

Where SN11 ranks among 2,813 postcode districts

Most collisions
1,715th
Most casualties
1,723rd
Most fatal collisions
1,003rd
Most serious collisions
1,600th

Collisions by day of the week

  • Monday271 (13%)
  • Tuesday307 (15%)
  • Wednesday313 (15%)
  • Thursday322 (15%)
  • Friday342 (16%)
  • Saturday286 (14%)
  • Sunday250 (12%)

Light conditions

  • Daylight1,501 (72%)
  • Dark, no street lighting304 (15%)
  • Dark, street lights lit248 (12%)
  • Dark, street lights unlit24 (1.1%)
  • Dark, lighting unknown14 (0.7%)

Type of road

  • Single carriageway2,008 (96%)
  • Roundabout56 (2.7%)
  • Dual carriageway14 (0.7%)
  • One way street or slip road9 (0.4%)
  • Not recorded4 (0.2%)

Speed limit at the scene

  • 20 mph20 (1%)
  • 30 mph796 (38%)
  • 40 mph125 (6%)
  • 50 mph119 (5.7%)
  • 60 mph976 (47%)
  • 70 mph55 (2.6%)

Weather at the time

  • Fine, no high winds1,664 (80%)
  • Raining, no high winds271 (13%)
  • Raining with high winds47 (2.2%)
  • Fine with high winds28 (1.3%)
  • Fog or mist24 (1.1%)
  • Snowing, no high winds10 (0.5%)
  • Snowing with high winds3 (0.1%)
  • Other6 (0.3%)
  • Not recorded38 (1.8%)

Who was hurt

  • Car occupant1,666 (59%)
  • Motorcyclist467 (17%)
  • Pedestrian277 (9.8%)
  • Cyclist222 (7.9%)
  • Van occupant99 (3.5%)
  • Goods vehicle occupant (over 3.5 tonnes)40 (1.4%)
  • Bus or coach occupant24 (0.9%)
  • Other vehicle occupant12 (0.4%)
  • Horse rider3 (0.1%)
  • Minibus occupant3 (0.1%)
  • Other6 (0.2%)

Source: Department for Transport, STATS19 road safety data

SN11 road accidents by year

Collisions and casualties in SN11, 1979 to 2025

Collisions in SN11 peaked at 74 in 1979; 2025 had 38.

  • Collisions
  • Collisions in 2025: 38
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20253848
20243038
20233134
20224150
20213541
20202634
20193948
20182938
20172026
20163136
20153642
20142430
20132533
20123039
20113542
20102224
20092330
20082333
20073150
20065175
20056376
20046178
20035569
20025068
20014770
20005376
19997194
19984157
19974159
19966379
19954774
19943954
19934462
19924150
19914163
199066105
19895479
19885481
19874767
19865380
19856391
19846184
19835668
19825775
198171101
19805873
19797495

Map of recent crashes in SN11

Map of the 24 most recent crashes in SN11

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in SN11

The 24 most recent collisions in SN11 happened between 26 May and 24 December 2025.

Severity

Crashes by road in SN11

The A4 has the most collisions in SN11, 655 of 2,091 (31%), followed by the A3102 (594).

Collisions in SN11 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA465593423135
2ndA310259483421148
3rdA342107158523
4thB30365900
5thB42704500

Council areas covering SN11

Collisions in SN11 were recorded in 2 council areas. Wiltshire has 2,072 of 2,091 (99%).

Collisions in SN11 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stWiltshire2,0722,79557459
2ndVale of Glamorgan172201

Town in SN11

Of the 2,091 collisions in SN11, 858 (41%) were in Calne.