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CrashStats

B3121 accidents: crash map and statistics

Police recorded 806 collisions on the B3121 from 1982 to 2025, with 988 casualties. Of those crashes, 11 were fatal and 133 serious, and 11 people were killed.

In 2025 there were 10 collisions on the B3121, up 25% from 8 in 2024, with 10 casualties.

Collisions since 1982
806
1,326th highest of 4,923 roads
Casualties
988
1.23 per collision
Fatal collisions
11
11 people killed
Serious collisions
133
146 seriously injured
Collisions in 2025
10
Up 25% on 2024
Casualties in 2025
10
Up 25% on 2024

Crash severity on the B3121

On the B3121, 1.4% of collisions were fatal and 17% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1982 to 2025

  • Fatal111.4%
  • Serious13317%
  • Slight66282%

Where the B3121 ranks among 4,923 roads

Most collisions
1,326th
Most casualties
1,448th
Most fatal collisions
1,595th
Most serious collisions
1,517th

B3121 accidents by year

Collisions on the B3121 peaked at 41 in 1984 and were down to 10 in 2025.

Collisions and casualties on the B3121, 1982 to 2025

  • Collisions
  • Collisions in 2025: 10
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251010
202488
202367
2022910
202168
202077
201979
201889
20171116
20161111
20151111
20141322
20131717
20121217
2011912
20101213
20091622
20081521
20071618
20062025
20051723
200488
20031417
20021418
20011924
20001325
19991723
19982027
19972225
19961825
19951924
19942127
19931919
19923033
19913743
19902330
19893546
19883548
19873943
19863843
19852629
19844148
19832427
19823340

When crashes happen on the B3121

Tuesday has the most collisions on the B3121 (140), and 3pm to 6pm is the busiest time of day (203).

Collisions by day of the week

  • Monday114 (14%)
  • Tuesday140 (17%)
  • Wednesday133 (17%)
  • Thursday134 (17%)
  • Friday128 (16%)
  • Saturday98 (12%)
  • Sunday59 (7.3%)

Collisions by time of day

  • Midnight to 3am17 (2.1%)
  • 3am to 6am7 (0.9%)
  • 6am to 9am127 (16%)
  • 9am to noon120 (15%)
  • Noon to 3pm133 (17%)
  • 3pm to 6pm203 (25%)
  • 6pm to 9pm135 (17%)
  • 9pm to midnight64 (7.9%)

Collisions by month

  • January49 (6.1%)
  • February64 (7.9%)
  • March78 (9.7%)
  • April58 (7.2%)
  • May72 (8.9%)
  • June71 (8.8%)
  • July65 (8.1%)
  • August58 (7.2%)
  • September62 (7.7%)
  • October69 (8.6%)
  • November87 (11%)
  • December73 (9.1%)

Light conditions at the time

  • Daylight584 (72%)
  • Dark, street lights lit191 (24%)
  • Dark, lighting unknown19 (2.4%)
  • Dark, street lights unlit8 (1%)
  • Dark, no street lighting4 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B3121 crashes

On the B3121, 85% of collisions happened where the speed limit was 30 mph and 69% on a dry road surface.

Speed limit at the scene

  • 20 mph1 (0.1%)
  • 30 mph688 (85%)
  • 40 mph110 (14%)
  • 50 mph1 (0.1%)
  • 60 mph5 (0.6%)
  • 70 mph1 (0.1%)

Weather at the time

  • Fine, no high winds622 (77%)
  • Raining, no high winds112 (14%)
  • Fine with high winds7 (0.9%)
  • Raining with high winds5 (0.6%)
  • Other27 (3.3%)
  • Not recorded33 (4.1%)

Road surface

  • Dry553 (69%)
  • Wet or damp247 (31%)
  • Frost or ice4 (0.5%)
  • Snow2 (0.2%)

Type of road

  • Single carriageway743 (92%)
  • Roundabout40 (5%)
  • Dual carriageway9 (1.1%)
  • One way street or slip road1 (0.1%)
  • Not recorded13 (1.6%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B3121 crashes

Car occupants make up 45% of the people killed or injured on the B3121, followed by motorcyclists (22%).

Casualties by road user

  • Car occupant447 (45%)
  • Motorcyclist219 (22%)
  • Cyclist161 (16%)
  • Pedestrian139 (14%)
  • Van occupant10 (1%)
  • Bus or coach occupant9 (0.9%)
  • Other vehicle occupant2 (0.2%)
  • Goods vehicle occupant (over 3.5 tonnes)1 (0.1%)

Vehicles involved

  • Car1,009 (67%)
  • Motorcycle236 (16%)
  • Pedal cycle167 (11%)
  • Van or goods vehicle up to 3.5 tonnes46 (3.1%)
  • Bus or coach17 (1.1%)
  • Other vehicle11 (0.7%)
  • Goods vehicle over 3.5 tonnes9 (0.6%)
  • Other8 (0.5%)

Casualties by age

  • 0 to 522 (2.2%)
  • 6 to 1032 (3.2%)
  • 11 to 1563 (6.4%)
  • 16 to 20230 (23%)
  • 21 to 25122 (12%)
  • 26 to 35152 (15%)
  • 36 to 45114 (12%)
  • 46 to 5574 (7.5%)
  • 56 to 6568 (6.9%)
  • 66 to 7541 (4.1%)
  • Over 7543 (4.4%)
  • Not recorded27 (2.7%)

Drivers, passengers and pedestrians

  • Driver or rider696 (70%)
  • Passenger153 (15%)
  • Pedestrian139 (14%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B3121

Map of the 25 most recent crashes on the B3121

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

  • 25 crashes
  • Serious
  • Slight

B3121 crashes by council area

Collisions on the B3121 were recorded in 3 council areas. Runnymede has the most, with 789, followed by Elmbridge (10) and South Hams (4).

Collisions on the B3121 in each area, 1982 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stRunnymede78997111132
2ndElmbridge101001
3rdSouth Hams4400

B3121 crashes by town

Collisions on the B3121 were recorded in 2 towns and built-up areas, led by Addlestone (615) and Byfleet, New Haw and West Byfleet (105).

Recent crashes on the B3121

These are the 25 most recent collisions on the B3121, from 16 December 2022 to 12 December 2025.

Severity