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CrashStats

SL4 road accidents: crash map and statistics

Police recorded 6,559 road traffic collisions in the SL4 postcode district, Windsor and Maidenhead, from 1979 to 2025, and 8,518 people were killed or injured in them. Of those collisions, 108 were fatal and 1,061 were serious.

In 2025 police recorded 47 collisions, down 2% on 2024 (48).

Collisions since 1979
6,559
235th highest of 2,813 postcode districts
Casualties
8,518
1.30 per collision
Fatal collisions
108
115 people killed
Serious collisions
1,061
1,231 seriously injured
Collisions in 2025
47
Down 2% on 2024
Casualties in 2025
57
Down 3% on 2024

Road collision statistics for SL4

Collisions by severity, 1979 to 2025

  • Fatal1081.6%
  • Serious1,06116%
  • Slight5,39082%

What the data shows

  • SL4 had 658 collisions from 2016 to 2025, 46% fewer than the 1,219 from 2006 to 2015.
  • 18% of collisions in SL4 were fatal or serious, against 20% across Great Britain.
  • 799 children under 16 were killed or injured in SL4, 9.6% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 31% of collisions in SL4.

Where SL4 ranks among 2,813 postcode districts

Most collisions
235th
Most casualties
264th
Most fatal collisions
238th
Most serious collisions
330th

Collisions by day of the week

  • Monday862 (13%)
  • Tuesday943 (14%)
  • Wednesday1,006 (15%)
  • Thursday998 (15%)
  • Friday1,121 (17%)
  • Saturday870 (13%)
  • Sunday759 (12%)

Light conditions

  • Daylight4,733 (72%)
  • Dark, street lights lit1,295 (20%)
  • Dark, no street lighting442 (6.7%)
  • Dark, lighting unknown62 (0.9%)
  • Dark, street lights unlit23 (0.4%)
  • Not recorded4 (0.1%)

Type of road

  • Single carriageway4,859 (74%)
  • Roundabout794 (12%)
  • Dual carriageway659 (10%)
  • One way street or slip road243 (3.7%)
  • Not recorded4 (0.1%)

Speed limit at the scene

  • 20 mph54 (0.8%)
  • 30 mph3,578 (55%)
  • 40 mph841 (13%)
  • 50 mph174 (2.7%)
  • 60 mph1,508 (23%)
  • 70 mph404 (6.2%)

Weather at the time

  • Fine, no high winds5,349 (82%)
  • Raining, no high winds775 (12%)
  • Fine with high winds82 (1.3%)
  • Raining with high winds51 (0.8%)
  • Fog or mist45 (0.7%)
  • Snowing, no high winds25 (0.4%)
  • Snowing with high winds3 (under 0.1%)
  • Other169 (2.6%)
  • Not recorded60 (0.9%)

Who was hurt

  • Car occupant4,960 (58%)
  • Motorcyclist1,154 (14%)
  • Cyclist1,081 (13%)
  • Pedestrian957 (11%)
  • Van occupant155 (1.8%)
  • Taxi or private hire car occupant65 (0.8%)
  • Other vehicle occupant36 (0.4%)
  • Bus or coach occupant35 (0.4%)
  • Goods vehicle occupant (over 3.5 tonnes)35 (0.4%)
  • Minibus occupant29 (0.3%)
  • Other9 (0.1%)
  • Not recorded2 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

SL4 road accidents by year

Collisions and casualties in SL4, 1979 to 2025

Collisions in SL4 peaked at 240 in 1984; 2025 had 47.

  • Collisions
  • Collisions in 2025: 47
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20254757
20244859
20236675
20226889
20215761
20205363
20196991
20186485
20178099
2016106133
2015104139
2014112144
2013111145
2012110178
2011121149
2010116148
2009115152
2008143192
2007141192
2006146189
2005151206
2004130164
2003149199
2002141192
2001169240
2000167206
1999144180
1998143169
1997154191
1996130168
1995170231
1994165197
1993128160
1992150206
1991150183
1990186256
1989191259
1988199262
1987193260
1986200254
1985210267
1984240308
1983198250
1982223300
1981195255
1980203253
1979203262

Map of recent crashes in SL4

Map of the 24 most recent crashes in SL4

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in SL4

The 24 most recent collisions in SL4 happened between 2 July and 21 December 2025.

Severity

Crashes by road in SL4

The A308 has the most collisions in SL4, 1,413 of 6,559 (22%), followed by the A332 (879).

Collisions in SL4 on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA3081,4131,81832206
2ndA3328791,30024149
3rdB30228051,0639125
4thB30246277326102
5thB3026266347456
6thA330260382449
7thB470133157223
8thM4115172316
9thB383103155621
10thB302194119413
11thB3175648016
12thA3556083112
13thA328486929
14thB3173445108
15thA322324903
16thB3025273303
17thB30347903

Council areas covering SL4

Collisions in SL4 were recorded in 5 council areas. Windsor and Maidenhead has 5,498 of 6,559 (84%).

Collisions in SL4 by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stWindsor and Maidenhead5,4986,98285872
2ndBracknell Forest7291,05713136
3rdBuckinghamshire210294532
4thRunnymede65101415
5thSlough568316

Towns in SL4

Collisions in SL4 were recorded in 3 towns, led by Windsor (2,993) and Old Windsor and Wraysbury (359).