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CrashStats

B4630 accidents: crash map and statistics

Police recorded 240 collisions on the B4630 from 1980 to 2025, with 306 casualties. Of those crashes, 2 were fatal and 46 serious, and 2 people were killed.

In 2025 there was 1 collision on the B4630, down 88% from 8 in 2024, with 1 casualty.

Collisions since 1980
240
3,011th highest of 4,923 roads
Casualties
306
1.28 per collision
Fatal collisions
2
2 people killed
Serious collisions
46
51 seriously injured
Collisions in 2025
1
Down 88% on 2024
Casualties in 2025
1
Down 88% on 2024

Crash severity on the B4630

On the B4630, 0.8% of collisions were fatal and 19% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1980 to 2025

  • Fatal20.8%
  • Serious4619%
  • Slight19280%

Where the B4630 ranks among 4,923 roads

Most collisions
3,011th
Most casualties
3,095th
Most fatal collisions
3,485th
Most serious collisions
3,090th

B4630 accidents by year

Collisions on the B4630 peaked at 15 in 1985 and were down to 1 in 2025.

Collisions and casualties on the B4630, 1980 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202488
202346
202200
202111
202022
201922
201811
201711
201611
201536
201411
201311
201234
201134
201033
200922
200858
2007910
200611
2005611
200457
20031014
20021112
200145
200033
199977
199888
1997510
1996811
199578
199433
199345
1992810
199167
199057
198933
1988610
19871112
19861015
19851520
198488
19831018
19821314
1981911
198034

When crashes happen on the B4630

Thursday has the most collisions on the B4630 (43), and 3pm to 6pm is the busiest time of day (54).

Collisions by day of the week

  • Monday35 (15%)
  • Tuesday33 (14%)
  • Wednesday38 (16%)
  • Thursday43 (18%)
  • Friday31 (13%)
  • Saturday32 (13%)
  • Sunday28 (12%)

Collisions by time of day

  • Midnight to 3am11 (4.6%)
  • 3am to 6am1 (0.4%)
  • 6am to 9am44 (18%)
  • 9am to noon37 (15%)
  • Noon to 3pm37 (15%)
  • 3pm to 6pm54 (23%)
  • 6pm to 9pm32 (13%)
  • 9pm to midnight24 (10%)

Collisions by month

  • January25 (10%)
  • February23 (9.6%)
  • March19 (7.9%)
  • April16 (6.7%)
  • May15 (6.3%)
  • June9 (3.8%)
  • July20 (8.3%)
  • August16 (6.7%)
  • September18 (7.5%)
  • October23 (9.6%)
  • November28 (12%)
  • December28 (12%)

Light conditions at the time

  • Daylight167 (70%)
  • Dark, street lights lit68 (28%)
  • Dark, street lights unlit3 (1.3%)
  • Dark, lighting unknown1 (0.4%)
  • Dark, no street lighting1 (0.4%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4630 crashes

On the B4630, 67% of collisions happened where the speed limit was 30 mph and 55% on a dry road surface.

Speed limit at the scene

  • 30 mph160 (67%)
  • 40 mph80 (33%)

Weather at the time

  • Fine, no high winds187 (78%)
  • Raining, no high winds40 (17%)
  • Raining with high winds3 (1.3%)
  • Fog or mist2 (0.8%)
  • Fine with high winds1 (0.4%)
  • Other7 (2.9%)

Road surface

  • Dry132 (55%)
  • Wet or damp101 (42%)
  • Frost or ice4 (1.7%)
  • Snow2 (0.8%)
  • Not recorded1 (0.4%)

Type of road

  • Single carriageway209 (87%)
  • Dual carriageway16 (6.7%)
  • Roundabout15 (6.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4630 crashes

Car occupants make up 59% of the people killed or injured on the B4630, followed by motorcyclists (16%).

Casualties by road user

  • Car occupant181 (59%)
  • Motorcyclist48 (16%)
  • Pedestrian41 (13%)
  • Cyclist24 (7.8%)
  • Van occupant5 (1.6%)
  • Taxi or private hire car occupant3 (1%)
  • Other vehicle occupant2 (0.7%)
  • Other2 (0.7%)

Vehicles involved

  • Car337 (75%)
  • Motorcycle48 (11%)
  • Pedal cycle24 (5.4%)
  • Van or goods vehicle up to 3.5 tonnes17 (3.8%)
  • Other vehicle6 (1.3%)
  • Taxi or private hire car6 (1.3%)
  • Goods vehicle over 3.5 tonnes5 (1.1%)
  • Other5 (1.1%)

Casualties by age

  • 0 to 51 (0.3%)
  • 6 to 106 (2%)
  • 11 to 1518 (5.9%)
  • 16 to 2071 (23%)
  • 21 to 2529 (9.5%)
  • 26 to 3561 (20%)
  • 36 to 4547 (15%)
  • 46 to 5524 (7.8%)
  • 56 to 6522 (7.2%)
  • 66 to 7516 (5.2%)
  • Over 7511 (3.6%)

Drivers, passengers and pedestrians

  • Driver or rider200 (65%)
  • Passenger65 (21%)
  • Pedestrian41 (13%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4630

Map of the 25 most recent crashes on the B4630

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

  • 25 crashes
  • Serious
  • Slight

B4630 crashes by council area

Of the 240 collisions on the B4630, 239 were in St Albans.

Collisions on the B4630 in each area, 1980 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSt Albans239304246

B4630 crashes by town

Collisions on the B4630 were recorded in 2 towns and built-up areas, led by Chiswell Green (158) and St Albans (63).

Recent crashes on the B4630

These are the 25 most recent collisions on the B4630, from 17 July 2014 to 14 November 2025.

Severity