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CrashStats

A366 accidents: crash map and statistics

Police recorded 489 collisions on the A366 from 1979 to 2025, with 696 casualties. Of those crashes, 13 were fatal and 96 serious, and 13 people were killed.

In 2025 there were 10 collisions on the A366, up 25% from 8 in 2024, with 15 casualties.

Collisions since 1979
489
2,006th highest of 4,923 roads
Casualties
696
1.42 per collision
Fatal collisions
13
13 people killed
Serious collisions
96
124 seriously injured
Collisions in 2025
10
Up 25% on 2024
Casualties in 2025
15
Up 67% on 2024

Crash severity on the A366

On the A366, 2.7% of collisions were fatal and 20% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal132.7%
  • Serious9620%
  • Slight38078%

Where the A366 ranks among 4,923 roads

Most collisions
2,006th
Most casualties
1,931st
Most fatal collisions
1,413th
Most serious collisions
1,982nd

A366 accidents by year

Collisions on the A366 peaked at 20 in 2000 and were down to 10 in 2025.

Collisions and casualties on the A366, 1979 to 2025

  • Collisions
  • Collisions in 2025
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251015
202489
202357
2022710
202157
202055
2019712
201878
201733
201678
201579
201444
20131014
20121013
2011814
201056
2009310
2008811
20071316
2006712
20051724
20041014
20031217
20021730
20011519
20002027
19991112
19981215
19971620
19961113
19951628
1994811
19931721
199289
19911124
199056
19891336
19881524
19871221
1986710
19851012
19841017
1983911
19821518
19811617
19802025
19791722

When crashes happen on the A366

Friday has the most collisions on the A366 (90), and 3pm to 6pm is the busiest time of day (131).

Collisions by day of the week

  • Monday73 (15%)
  • Tuesday64 (13%)
  • Wednesday67 (14%)
  • Thursday83 (17%)
  • Friday90 (18%)
  • Saturday59 (12%)
  • Sunday53 (11%)

Collisions by time of day

  • Midnight to 3am13 (2.7%)
  • 3am to 6am12 (2.5%)
  • 6am to 9am73 (15%)
  • 9am to noon58 (12%)
  • Noon to 3pm80 (16%)
  • 3pm to 6pm131 (27%)
  • 6pm to 9pm77 (16%)
  • 9pm to midnight45 (9.2%)

Collisions by month

  • January31 (6.3%)
  • February34 (7%)
  • March40 (8.2%)
  • April37 (7.6%)
  • May35 (7.2%)
  • June47 (9.6%)
  • July46 (9.4%)
  • August40 (8.2%)
  • September53 (11%)
  • October43 (8.8%)
  • November47 (9.6%)
  • December36 (7.4%)

Light conditions at the time

  • Daylight359 (73%)
  • Dark, no street lighting78 (16%)
  • Dark, street lights lit44 (9%)
  • Dark, lighting unknown4 (0.8%)
  • Dark, street lights unlit4 (0.8%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A366 crashes

On the A366, 55% of collisions happened where the speed limit was 60 mph and 61% on a dry road surface.

Speed limit at the scene

  • 30 mph157 (32%)
  • 40 mph38 (7.8%)
  • 50 mph13 (2.7%)
  • 60 mph270 (55%)
  • 70 mph11 (2.2%)

Weather at the time

  • Fine, no high winds377 (77%)
  • Raining, no high winds80 (16%)
  • Raining with high winds9 (1.8%)
  • Fine with high winds3 (0.6%)
  • Other15 (3.1%)
  • Not recorded5 (1%)

Road surface

  • Dry298 (61%)
  • Wet or damp172 (35%)
  • Frost or ice14 (2.9%)
  • Snow3 (0.6%)
  • Flood over 3cm deep2 (0.4%)

Type of road

  • Single carriageway450 (92%)
  • Roundabout16 (3.3%)
  • One way street or slip road13 (2.7%)
  • Dual carriageway2 (0.4%)
  • Not recorded8 (1.6%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A366 crashes

Car occupants make up 65% of the people killed or injured on the A366, followed by motorcyclists (11%).

Casualties by road user

  • Car occupant454 (65%)
  • Motorcyclist79 (11%)
  • Pedestrian64 (9.2%)
  • Cyclist45 (6.5%)
  • Bus or coach occupant23 (3.3%)
  • Van occupant21 (3%)
  • Other vehicle occupant6 (0.9%)
  • Other4 (0.6%)

Vehicles involved

  • Car634 (75%)
  • Motorcycle85 (10%)
  • Pedal cycle46 (5.4%)
  • Van or goods vehicle up to 3.5 tonnes44 (5.2%)
  • Other vehicle15 (1.8%)
  • Goods vehicle over 3.5 tonnes12 (1.4%)
  • Bus or coach7 (0.8%)
  • Other8 (0.9%)

Casualties by age

  • 0 to 58 (1.1%)
  • 6 to 1030 (4.3%)
  • 11 to 1543 (6.2%)
  • 16 to 20131 (19%)
  • 21 to 2592 (13%)
  • 26 to 35124 (18%)
  • 36 to 45110 (16%)
  • 46 to 5560 (8.6%)
  • 56 to 6543 (6.2%)
  • 66 to 7535 (5%)
  • Over 7517 (2.4%)
  • Not recorded3 (0.4%)

Drivers, passengers and pedestrians

  • Driver or rider443 (64%)
  • Passenger189 (27%)
  • Pedestrian64 (9.2%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A366

Map of the 25 most recent crashes on the A366

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

  • 25 crashes
  • Serious
  • Slight

A366 crashes by council area

Collisions on the A366 were recorded in 2 council areas. Wiltshire has the most, with 313, followed by Somerset (175).

Collisions on the A366 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWiltshire313437655
2ndSomerset175257740

A366 crashes by town

Of the 489 collisions on the A366, 140 were in the built-up area of Trowbridge.

Recent crashes on the A366

These are the 25 most recent collisions on the A366, from 16 October 2022 to 25 September 2025.

Severity