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CrashStats

A4312 accidents: crash map and statistics

Police recorded 646 collisions on the A4312 from 1979 to 2025, with 835 casualties. Of those crashes, 5 were fatal and 84 serious, and 5 people were killed.

In 2025 there were 11 collisions on the A4312, up 38% from 8 in 2024, with 12 casualties.

Collisions since 1979
646
1,602nd highest of 4,923 roads
Casualties
835
1.29 per collision
Fatal collisions
5
5 people killed
Serious collisions
84
88 seriously injured
Collisions in 2025
11
Up 38% on 2024
Casualties in 2025
12
Up 33% on 2024

Crash severity on the A4312

On the A4312, 0.8% of collisions were fatal and 13% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal50.8%
  • Serious8413%
  • Slight55786%

Where the A4312 ranks among 4,923 roads

Most collisions
1,602nd
Most casualties
1,663rd
Most fatal collisions
2,545th
Most serious collisions
2,192nd

A4312 accidents by year

Collisions on the A4312 peaked at 37 in 1985 and were down to 11 in 2025.

Collisions and casualties on the A4312, 1979 to 2025

  • Collisions
  • Collisions in 2025: 11
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251112
202489
20231724
202279
20211215
2020810
20191226
20181215
20172633
20161830
20151318
201479
2013914
20121320
20111016
201057
20091220
20081319
20071518
20061721
20051214
20041823
20031925
20022532
20012029
20001520
19992332
19981723
19972632
19961927
19951516
199488
199367
19921416
19911214
1990911
19891415
19882630
19872022
19862731
19853743
19841515
198300
198200
198122
198011
197912

When crashes happen on the A4312

Friday has the most collisions on the A4312 (107), and 3pm to 6pm is the busiest time of day (160).

Collisions by day of the week

  • Monday92 (14%)
  • Tuesday103 (16%)
  • Wednesday89 (14%)
  • Thursday99 (15%)
  • Friday107 (17%)
  • Saturday76 (12%)
  • Sunday80 (12%)

Collisions by time of day

  • Midnight to 3am17 (2.6%)
  • 3am to 6am6 (0.9%)
  • 6am to 9am86 (13%)
  • 9am to noon79 (12%)
  • Noon to 3pm127 (20%)
  • 3pm to 6pm160 (25%)
  • 6pm to 9pm117 (18%)
  • 9pm to midnight54 (8.4%)

Collisions by month

  • January50 (7.7%)
  • February53 (8.2%)
  • March36 (5.6%)
  • April60 (9.3%)
  • May70 (11%)
  • June46 (7.1%)
  • July60 (9.3%)
  • August52 (8%)
  • September58 (9%)
  • October52 (8%)
  • November60 (9.3%)
  • December49 (7.6%)

Light conditions at the time

  • Daylight477 (74%)
  • Dark, street lights lit156 (24%)
  • Dark, street lights unlit7 (1.1%)
  • Dark, lighting unknown4 (0.6%)
  • Dark, no street lighting2 (0.3%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4312 crashes

On the A4312, 64% of collisions happened where the speed limit was 40 mph and 70% on a dry road surface.

Speed limit at the scene

  • 30 mph219 (34%)
  • 40 mph411 (64%)
  • 50 mph1 (0.2%)
  • 60 mph11 (1.7%)
  • 70 mph4 (0.6%)

Weather at the time

  • Fine, no high winds533 (83%)
  • Raining, no high winds70 (11%)
  • Raining with high winds13 (2%)
  • Fine with high winds9 (1.4%)
  • Other10 (1.5%)
  • Not recorded11 (1.7%)

Road surface

  • Dry453 (70%)
  • Wet or damp183 (28%)
  • Frost or ice8 (1.2%)
  • Snow2 (0.3%)

Type of road

  • Dual carriageway237 (37%)
  • Roundabout214 (33%)
  • Single carriageway194 (30%)
  • Not recorded1 (0.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4312 crashes

Car occupants make up 59% of the people killed or injured on the A4312, followed by motorcyclists (15%).

Casualties by road user

  • Car occupant495 (59%)
  • Motorcyclist125 (15%)
  • Cyclist116 (14%)
  • Pedestrian68 (8.1%)
  • Van occupant16 (1.9%)
  • Bus or coach occupant4 (0.5%)
  • Other vehicle occupant4 (0.5%)
  • Other7 (0.8%)

Vehicles involved

  • Car947 (73%)
  • Motorcycle124 (9.5%)
  • Pedal cycle116 (8.9%)
  • Van or goods vehicle up to 3.5 tonnes67 (5.1%)
  • Goods vehicle over 3.5 tonnes20 (1.5%)
  • Bus or coach13 (1%)
  • Other vehicle8 (0.6%)
  • Other8 (0.6%)

Casualties by age

  • 0 to 58 (1%)
  • 6 to 1028 (3.4%)
  • 11 to 1555 (6.6%)
  • 16 to 20141 (17%)
  • 21 to 25106 (13%)
  • 26 to 35167 (20%)
  • 36 to 45133 (16%)
  • 46 to 5597 (12%)
  • 56 to 6565 (7.8%)
  • 66 to 7526 (3.1%)
  • Over 758 (1%)
  • Not recorded1 (0.1%)

Drivers, passengers and pedestrians

  • Driver or rider570 (68%)
  • Passenger197 (24%)
  • Pedestrian68 (8.1%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4312

Map of the 25 most recent crashes on the A4312

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

  • 25 crashes
  • Serious
  • Slight

A4312 crashes by council area

Collisions on the A4312 were recorded in 3 council areas. Swindon has the most, with 638, followed by Hounslow (4) and Carmarthenshire (3).

Collisions on the A4312 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSwindon638824583
2ndHounslow4500
3rdCarmarthenshire3501

A4312 crashes by town

Collisions on the A4312 were recorded in 3 towns and built-up areas, led by Stratton St Margaret (294) and Swindon, Swindon (292).

Recent crashes on the A4312

These are the 25 most recent collisions on the A4312, from 31 July 2023 to 10 November 2025.

Severity