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CrashStats

B3420 accidents: crash map and statistics

Police recorded 503 collisions on the B3420 from 1979 to 2025, with 691 casualties. Of those crashes, 15 were fatal and 109 serious, and 17 people were killed.

In 2025 there were 5 collisions on the B3420, level with 2024, with 5 casualties.

Collisions since 1979
503
1,961st highest of 4,923 roads
Casualties
691
1.37 per collision
Fatal collisions
15
17 people killed
Serious collisions
109
128 seriously injured
Collisions in 2025
5
Level with 2024
Casualties in 2025
5
Level with 2024

Crash severity on the B3420

On the B3420, 3% of collisions were fatal and 22% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal153%
  • Serious10922%
  • Slight37975%

Where the B3420 ranks among 4,923 roads

Most collisions
1,961st
Most casualties
1,940th
Most fatal collisions
1,258th
Most serious collisions
1,774th

B3420 accidents by year

Collisions on the B3420 peaked at 22 in 1982 and were down to 5 in 2025.

Collisions and casualties on the B3420, 1979 to 2025

  • Collisions
  • Collisions in 2025: 5
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202555
202455
20231214
2022811
202144
202056
20191012
20181216
20171015
201677
2015814
201466
201388
20121420
20111317
20101010
200955
200877
2007810
200656
20051214
20041016
2003811
20021424
20011322
2000812
19991116
1998812
19971320
19962032
19951521
199466
19931217
19921323
19911113
19901621
19891622
1988915
19872030
19861013
19851214
19841517
19831316
19822233
1981914
19801319
19791220

When crashes happen on the B3420

Wednesday has the most collisions on the B3420 (90), and 3pm to 6pm is the busiest time of day (117).

Collisions by day of the week

  • Monday74 (15%)
  • Tuesday65 (13%)
  • Wednesday90 (18%)
  • Thursday89 (18%)
  • Friday84 (17%)
  • Saturday53 (11%)
  • Sunday48 (9.5%)

Collisions by time of day

  • Midnight to 3am13 (2.6%)
  • 3am to 6am2 (0.4%)
  • 6am to 9am77 (15%)
  • 9am to noon69 (14%)
  • Noon to 3pm93 (18%)
  • 3pm to 6pm117 (23%)
  • 6pm to 9pm81 (16%)
  • 9pm to midnight51 (10%)

Collisions by month

  • January50 (9.9%)
  • February53 (11%)
  • March39 (7.8%)
  • April33 (6.6%)
  • May45 (8.9%)
  • June28 (5.6%)
  • July32 (6.4%)
  • August35 (7%)
  • September49 (9.7%)
  • October56 (11%)
  • November37 (7.4%)
  • December46 (9.1%)

Light conditions at the time

  • Daylight354 (70%)
  • Dark, street lights lit87 (17%)
  • Dark, no street lighting49 (9.7%)
  • Dark, lighting unknown12 (2.4%)
  • Dark, street lights unlit1 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B3420 crashes

On the B3420, 43% of collisions happened where the speed limit was 30 mph and 65% on a dry road surface.

Speed limit at the scene

  • 20 mph6 (1.2%)
  • 30 mph215 (43%)
  • 40 mph50 (9.9%)
  • 50 mph75 (15%)
  • 60 mph127 (25%)
  • 70 mph30 (6%)

Weather at the time

  • Fine, no high winds397 (79%)
  • Raining, no high winds74 (15%)
  • Fine with high winds8 (1.6%)
  • Raining with high winds7 (1.4%)
  • Other16 (3.2%)
  • Not recorded1 (0.2%)

Road surface

  • Dry328 (65%)
  • Wet or damp164 (33%)
  • Frost or ice8 (1.6%)
  • Flood over 3cm deep2 (0.4%)
  • Oil or diesel1 (0.2%)

Type of road

  • Single carriageway398 (79%)
  • Dual carriageway83 (17%)
  • Roundabout14 (2.8%)
  • One way street or slip road7 (1.4%)
  • Not recorded1 (0.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B3420 crashes

Car occupants make up 63% of the people killed or injured on the B3420, followed by motorcyclists (14%).

Casualties by road user

  • Car occupant438 (63%)
  • Motorcyclist98 (14%)
  • Cyclist62 (9%)
  • Pedestrian62 (9%)
  • Van occupant17 (2.5%)
  • Taxi or private hire car occupant5 (0.7%)
  • Bus or coach occupant4 (0.6%)
  • Other5 (0.7%)

Vehicles involved

  • Car653 (73%)
  • Motorcycle98 (11%)
  • Pedal cycle65 (7.3%)
  • Van or goods vehicle up to 3.5 tonnes44 (4.9%)
  • Goods vehicle over 3.5 tonnes13 (1.5%)
  • Taxi or private hire car11 (1.2%)
  • Bus or coach6 (0.7%)
  • Other6 (0.7%)

Casualties by age

  • 0 to 518 (2.6%)
  • 6 to 1015 (2.2%)
  • 11 to 1527 (3.9%)
  • 16 to 20165 (24%)
  • 21 to 2589 (13%)
  • 26 to 3590 (13%)
  • 36 to 4589 (13%)
  • 46 to 5574 (11%)
  • 56 to 6548 (6.9%)
  • 66 to 7532 (4.6%)
  • Over 7543 (6.2%)
  • Not recorded1 (0.1%)

Drivers, passengers and pedestrians

  • Driver or rider460 (67%)
  • Passenger169 (24%)
  • Pedestrian62 (9%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B3420

Map of the 25 most recent crashes on the B3420

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

  • 25 crashes
  • Serious
  • Slight

B3420 crashes by council area

Collisions on the B3420 were recorded in 2 council areas. Winchester has the most, with 428, followed by Test Valley (73).

Collisions on the B3420 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stWinchester4285801287
2ndTest Valley73109321

B3420 crashes by town

Collisions on the B3420 were recorded in 2 towns and built-up areas, led by Winchester (278) and Andover (4).

Recent crashes on the B3420

These are the 25 most recent collisions on the B3420, from 20 August 2022 to 1 December 2025.

Severity