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CrashStats

A404(M) accidents: crash map and statistics

Police recorded 211 collisions on the A404(M) from 1992 to 2025, with 306 casualties. Of those crashes, 5 were fatal and 23 serious, and 5 people were killed.

In 2025 there was 1 collision on the A404(M), level with 2024, with 2 casualties.

Live A404(M) closures, incidents and roadworks are checked every 5 minutes.

Collisions since 1992
211
3,173rd highest of 4,923 roads
Casualties
306
1.45 per collision
Fatal collisions
5
5 people killed
Serious collisions
23
27 seriously injured
Collisions in 2025
1
Level with 2024
Casualties in 2025
2
Up 100% on 2024

Crash severity on the A404(M)

On the A404(M), 2.4% of collisions were fatal and 11% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1992 to 2025

  • Fatal52.4%
  • Serious2311%
  • Slight18387%

Where the A404(M) ranks among 4,923 roads

Most collisions
3,173rd
Most casualties
3,095th
Most fatal collisions
2,545th
Most serious collisions
3,899th

A404(M) accidents by year

Collisions on the A404(M) peaked at 13 in 2009 and were down to 1 in 2025.

Collisions and casualties on the A404(M), 1992 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202512
202411
202355
202200
2021713
202055
201900
201833
201768
201623
201544
201468
201368
2012912
201157
201068
20091320
200867
2007811
200656
200545
20041014
2003612
200268
20011113
200089
19991217
1998917
19971013
19961117
1995818
1994812
199368
1992412

When crashes happen on the A404(M)

Friday has the most collisions on the A404(M) (40), and 3pm to 6pm is the busiest time of day (48).

Collisions by day of the week

  • Monday37 (18%)
  • Tuesday28 (13%)
  • Wednesday27 (13%)
  • Thursday33 (16%)
  • Friday40 (19%)
  • Saturday29 (14%)
  • Sunday17 (8.1%)

Collisions by time of day

  • Midnight to 3am9 (4.3%)
  • 3am to 6am7 (3.3%)
  • 6am to 9am45 (21%)
  • 9am to noon23 (11%)
  • Noon to 3pm23 (11%)
  • 3pm to 6pm48 (23%)
  • 6pm to 9pm35 (17%)
  • 9pm to midnight21 (10%)

Collisions by month

  • January13 (6.2%)
  • February18 (8.5%)
  • March16 (7.6%)
  • April15 (7.1%)
  • May13 (6.2%)
  • June21 (10%)
  • July19 (9%)
  • August20 (9.5%)
  • September14 (6.6%)
  • October12 (5.7%)
  • November30 (14%)
  • December20 (9.5%)

Light conditions at the time

  • Daylight137 (65%)
  • Dark, no street lighting39 (18%)
  • Dark, street lights lit32 (15%)
  • Dark, lighting unknown2 (0.9%)
  • Dark, street lights unlit1 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A404(M) crashes

On the A404(M), 92% of collisions happened where the speed limit was 70 mph and 68% on a dry road surface.

Speed limit at the scene

  • 30 mph3 (1.4%)
  • 40 mph4 (1.9%)
  • 50 mph3 (1.4%)
  • 60 mph6 (2.8%)
  • 70 mph195 (92%)

Weather at the time

  • Fine, no high winds177 (84%)
  • Raining, no high winds27 (13%)
  • Fog or mist1 (0.5%)
  • Raining with high winds1 (0.5%)
  • Other3 (1.4%)
  • Not recorded2 (0.9%)

Road surface

  • Dry144 (68%)
  • Wet or damp62 (29%)
  • Frost or ice3 (1.4%)
  • Oil or diesel1 (0.5%)
  • Snow1 (0.5%)

Type of road

  • Dual carriageway160 (76%)
  • Roundabout35 (17%)
  • One way street or slip road14 (6.6%)
  • Single carriageway2 (0.9%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A404(M) crashes

Car occupants make up 82% of the people killed or injured on the A404(M), followed by motorcyclists (12%).

Casualties by road user

  • Car occupant252 (82%)
  • Motorcyclist37 (12%)
  • Van occupant7 (2.3%)
  • Goods vehicle occupant (over 3.5 tonnes)4 (1.3%)
  • Bus or coach occupant3 (1%)
  • Pedestrian2 (0.7%)
  • Taxi or private hire car occupant1 (0.3%)

Vehicles involved

  • Car368 (82%)
  • Motorcycle37 (8.2%)
  • Van or goods vehicle up to 3.5 tonnes24 (5.3%)
  • Goods vehicle over 3.5 tonnes16 (3.6%)
  • Bus or coach2 (0.4%)
  • Minibus1 (0.2%)
  • Taxi or private hire car1 (0.2%)

Casualties by age

  • 6 to 106 (2%)
  • 11 to 158 (2.6%)
  • 16 to 2043 (14%)
  • 21 to 2542 (14%)
  • 26 to 3572 (24%)
  • 36 to 4551 (17%)
  • 46 to 5544 (14%)
  • 56 to 6523 (7.5%)
  • 66 to 756 (2%)
  • Over 754 (1.3%)
  • Not recorded7 (2.3%)

Drivers, passengers and pedestrians

  • Driver or rider226 (74%)
  • Passenger78 (25%)
  • Pedestrian2 (0.7%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A404(M)

Map of the 25 most recent crashes on the A404(M)

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

  • 25 crashes
  • Serious
  • Slight

A404(M) crashes by council area

Of the 211 collisions on the A404(M), 210 were in Windsor and Maidenhead.

Collisions on the A404(M) in each area, 1992 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWindsor and Maidenhead210304523

A404(M) crashes by town

Of the 211 collisions on the A404(M), 84 were in the built-up area of Maidenhead.

Recent crashes on the A404(M)

These are the 25 most recent collisions on the A404(M), from 9 June 2017 to 27 June 2025.

Severity