Skip to main content
CrashStats

A312 accidents: crash map and statistics

Police recorded 11,676 collisions on the A312 from 1979 to 2025, with 14,573 casualties. Of those crashes, 101 were fatal and 1,538 serious, and 103 people were killed.

In 2025 there were 169 collisions on the A312, up 10% from 154 in 2024, with 199 casualties.

Live A312 closures, incidents and roadworks are checked every 5 minutes.

Collisions since 1979
11,676
65th highest of 4,923 roads
Casualties
14,573
1.25 per collision
Fatal collisions
101
103 people killed
Serious collisions
1,538
1,689 seriously injured
Collisions in 2025
169
Up 10% on 2024
Casualties in 2025
199
Level with 2024

Crash severity on the A312

On the A312, 0.9% of collisions were fatal and 13% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal1010.9%
  • Serious1,53813%
  • Slight10,03786%

Where the A312 ranks among 4,923 roads

Most collisions
65th
Most casualties
69th
Most fatal collisions
204th
Most serious collisions
107th

A312 accidents by year

Collisions on the A312 peaked at 362 in 1979 and were down to 169 in 2025.

Collisions and casualties on the A312, 1979 to 2025

  • Collisions
  • Collisions in 2025: 169
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
2025169199
2024154199
2023185234
2022164205
2021156185
2020148174
2019185245
2018168214
2017182256
2016204258
2015213282
2014243320
2013173241
2012213275
2011206268
2010202266
2009194250
2008192228
2007194242
2006213268
2005221270
2004236297
2003267347
2002291377
2001293350
2000283356
1999275339
1998282340
1997294376
1996271336
1995262328
1994235294
1993288361
1992268337
1991280327
1990317386
1989321383
1988308370
1987311365
1986326393
1985318409
1984346409
1983310360
1982295367
1981327431
1980331414
1979362442

When crashes happen on the A312

Friday has the most collisions on the A312 (1,937), and 3pm to 6pm is the busiest time of day (2,532).

Collisions by day of the week

  • Monday1,609 (14%)
  • Tuesday1,781 (15%)
  • Wednesday1,680 (14%)
  • Thursday1,828 (16%)
  • Friday1,937 (17%)
  • Saturday1,554 (13%)
  • Sunday1,287 (11%)

Collisions by time of day

  • Midnight to 3am399 (3.4%)
  • 3am to 6am247 (2.1%)
  • 6am to 9am1,495 (13%)
  • 9am to noon1,521 (13%)
  • Noon to 3pm2,130 (18%)
  • 3pm to 6pm2,532 (22%)
  • 6pm to 9pm2,017 (17%)
  • 9pm to midnight1,335 (11%)

Collisions by month

  • January926 (7.9%)
  • February868 (7.4%)
  • March946 (8.1%)
  • April929 (8%)
  • May911 (7.8%)
  • June963 (8.2%)
  • July1,011 (8.7%)
  • August965 (8.3%)
  • September1,035 (8.9%)
  • October1,091 (9.3%)
  • November1,017 (8.7%)
  • December1,014 (8.7%)

Light conditions at the time

  • Daylight7,916 (68%)
  • Dark, street lights lit3,607 (31%)
  • Dark, lighting unknown122 (1%)
  • Dark, street lights unlit26 (0.2%)
  • Dark, no street lighting5 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A312 crashes

On the A312, 72% of collisions happened where the speed limit was 30 mph and 75% on a dry road surface.

Speed limit at the scene

  • 20 mph256 (2.2%)
  • 30 mph8,445 (72%)
  • 40 mph2,193 (19%)
  • 50 mph512 (4.4%)
  • 60 mph115 (1%)
  • 70 mph155 (1.3%)

Weather at the time

  • Fine, no high winds8,720 (75%)
  • Raining, no high winds1,535 (13%)
  • Fine with high winds89 (0.8%)
  • Raining with high winds52 (0.4%)
  • Other1,060 (9.1%)
  • Not recorded220 (1.9%)

Road surface

  • Dry8,742 (75%)
  • Wet or damp2,736 (23%)
  • Frost or ice71 (0.6%)
  • Snow51 (0.4%)
  • Other6 (0.1%)
  • Not recorded70 (0.6%)

Type of road

  • Single carriageway5,843 (50%)
  • Dual carriageway3,532 (30%)
  • Roundabout1,618 (14%)
  • One way street or slip road130 (1.1%)
  • Not recorded553 (4.7%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A312 crashes

Car occupants make up 58% of the people killed or injured on the A312, followed by pedestrians (14%).

Casualties by road user

  • Car occupant8,470 (58%)
  • Pedestrian2,024 (14%)
  • Motorcyclist1,999 (14%)
  • Cyclist855 (5.9%)
  • Bus or coach occupant471 (3.2%)
  • Van occupant437 (3%)
  • Other312 (2.1%)
  • Not recorded5 (under 0.1%)

Vehicles involved

  • Car15,847 (73%)
  • Motorcycle2,108 (9.7%)
  • Van or goods vehicle up to 3.5 tonnes1,414 (6.5%)
  • Pedal cycle874 (4%)
  • Goods vehicle over 3.5 tonnes605 (2.8%)
  • Bus or coach570 (2.6%)
  • Other412 (1.9%)
  • Not recorded1 (under 0.1%)

Casualties by age

  • 0 to 5200 (1.4%)
  • 6 to 10367 (2.5%)
  • 11 to 15651 (4.5%)
  • 16 to 201,754 (12%)
  • 21 to 252,122 (15%)
  • 26 to 353,289 (23%)
  • 36 to 452,181 (15%)
  • 46 to 551,589 (11%)
  • 56 to 65864 (5.9%)
  • 66 to 75484 (3.3%)
  • Over 75270 (1.9%)
  • Not recorded802 (5.5%)

Drivers, passengers and pedestrians

  • Driver or rider9,129 (63%)
  • Passenger3,420 (23%)
  • Pedestrian2,024 (14%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A312

Map of the 25 most recent crashes on the A312

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

  • 25 crashes
  • Serious
  • Slight

A312 crashes by council area

Collisions on the A312 were recorded in 5 council areas. Hounslow has the most, with 4,334, followed by Ealing (3,149) and Hillingdon (2,385).

Collisions on the A312 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stHounslow4,3345,50740562
2ndEaling3,1493,92126414
3rdHillingdon2,3853,00322311
4thHarrow1,2751,49311173
5thRichmond upon Thames525637277

A312 crashes by town

Collisions on the A312 were recorded in 5 towns and built-up areas, led by Hounslow (2,845) and Ealing (2,612).

Recent crashes on the A312

These are the 25 most recent collisions on the A312, from 11 November to 31 December 2025.

Severity