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CrashStats

SN15 road accidents: crash map and statistics

Police recorded 5,917 road traffic collisions in the SN15 postcode district, Wiltshire, from 1979 to 2025, and 8,596 people were killed or injured in them. Of those collisions, 135 were fatal and 1,152 were serious.

In 2025 police recorded 73 collisions, up 30% on 2024 (56).

Collisions since 1979
5,917
342nd highest of 2,813 postcode districts
Casualties
8,596
1.45 per collision
Fatal collisions
135
156 people killed
Serious collisions
1,152
1,414 seriously injured
Collisions in 2025
73
Up 30% on 2024
Casualties in 2025
112
Up 45% on 2024

Road collision statistics for SN15

Collisions by severity, 1979 to 2025

  • Fatal1352.3%
  • Serious1,15219%
  • Slight4,63078%

What the data shows

  • SN15 had 681 collisions from 2016 to 2025, 25% fewer than the 911 from 2006 to 2015.
  • 22% of collisions in SN15 were fatal or serious, against 20% across Great Britain.
  • 749 children under 16 were killed or injured in SN15, 8.7% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 38% of collisions in SN15.

Where SN15 ranks among 2,813 postcode districts

Most collisions
342nd
Most casualties
258th
Most fatal collisions
109th
Most serious collisions
240th

Collisions by day of the week

  • Monday875 (15%)
  • Tuesday849 (14%)
  • Wednesday796 (13%)
  • Thursday927 (16%)
  • Friday1,023 (17%)
  • Saturday815 (14%)
  • Sunday632 (11%)

Light conditions

  • Daylight4,248 (72%)
  • Dark, no street lighting954 (16%)
  • Dark, street lights lit659 (11%)
  • Dark, street lights unlit32 (0.5%)
  • Dark, lighting unknown24 (0.4%)

Type of road

  • Single carriageway4,204 (71%)
  • Dual carriageway1,118 (19%)
  • One way street or slip road311 (5.3%)
  • Roundabout281 (4.7%)
  • Not recorded3 (0.1%)

Speed limit at the scene

  • 20 mph9 (0.2%)
  • 30 mph2,105 (36%)
  • 40 mph269 (4.5%)
  • 50 mph296 (5%)
  • 60 mph2,141 (36%)
  • 70 mph1,097 (19%)

Weather at the time

  • Fine, no high winds4,573 (77%)
  • Raining, no high winds813 (14%)
  • Fine with high winds142 (2.4%)
  • Raining with high winds133 (2.2%)
  • Fog or mist118 (2%)
  • Snowing, no high winds27 (0.5%)
  • Snowing with high winds8 (0.1%)
  • Other26 (0.4%)
  • Not recorded77 (1.3%)

Who was hurt

  • Car occupant5,703 (66%)
  • Motorcyclist1,041 (12%)
  • Pedestrian645 (7.5%)
  • Cyclist505 (5.9%)
  • Van occupant356 (4.1%)
  • Goods vehicle occupant (over 3.5 tonnes)201 (2.3%)
  • Minibus occupant60 (0.7%)
  • Bus or coach occupant34 (0.4%)
  • Other vehicle occupant24 (0.3%)
  • Taxi or private hire car occupant14 (0.2%)
  • Other12 (0.1%)
  • Not recorded1 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

SN15 road accidents by year

Collisions and casualties in SN15, 1979 to 2025

Collisions in SN15 peaked at 210 in 1983; 2025 had 73.

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202573112
20245677
20236083
20226286
20216982
20205267
201980105
20187298
201772107
201685119
201585121
2014106144
201392130
20127493
201177117
20107084
200990127
2008105157
200794123
2006118184
2005145206
2004142201
2003152240
2002137183
2001179271
2000175255
1999150230
1998162231
1997147233
1996141205
1995145229
1994160242
1993161228
1992132192
1991125188
1990164242
1989159221
1988145242
1987194289
1986169238
1985177276
1984193288
1983210296
1982169238
1981166246
1980151222
1979175248

Map of recent crashes in SN15

Map of the 24 most recent crashes in SN15

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in SN15

The 24 most recent collisions in SN15 happened between 5 October and 29 December 2025.

Severity

Crashes by road in SN15

The M4 has the most collisions in SN15, 919 of 5,917 (16%), followed by the A4 (828).

Collisions in SN15 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stM49191,57832168
2ndA48281,11818130
3rdA42050965811111
4thA3504937921590
5thB40694556311585
6thA3102387601676
7thA342335563485
8thB4042268381654
9thA429160243345
10thB415888101119
11thB4122405428
12thB45287801
13thB42683410

Council areas covering SN15

Collisions in SN15 were recorded in 3 council areas. Wiltshire has 5,903 of 5,917 (99.8%).

Collisions in SN15 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stWiltshire5,9038,5791341,151
2ndVale of Glamorgan91111
3rdBristol3300

Towns in SN15

Collisions in SN15 were recorded in 3 towns, led by Chippenham, Wiltshire (1,660) and Lyneham (242).