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CrashStats

A4146 accidents: crash map and statistics

Police recorded 3,534 collisions on the A4146 from 1979 to 2025, with 5,139 casualties. Of those crashes, 86 were fatal and 684 serious, and 92 people were killed.

In 2025 there were 23 collisions on the A4146, down 4% from 24 in 2024, with 31 casualties.

Collisions since 1979
3,534
320th highest of 4,923 roads
Casualties
5,139
1.45 per collision
Fatal collisions
86
92 people killed
Serious collisions
684
860 seriously injured
Collisions in 2025
23
Down 4% on 2024
Casualties in 2025
31
Down 3% on 2024

Crash severity on the A4146

On the A4146, 2.4% of collisions were fatal and 19% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal862.4%
  • Serious68419%
  • Slight2,76478%

Where the A4146 ranks among 4,923 roads

Most collisions
320th
Most casualties
297th
Most fatal collisions
251st
Most serious collisions
291st

A4146 accidents by year

Collisions on the A4146 peaked at 133 in 1987 and were down to 23 in 2025.

Collisions and casualties on the A4146, 1979 to 2025

  • Collisions
  • Collisions in 2025: 23
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252331
20242432
20232324
20222647
20211216
20201315
20192332
20183551
20174876
20165278
20155274
20144564
20136093
20125580
20115075
20105595
20096489
20086990
20077196
200699154
200585123
200490128
200376106
200279114
200190136
200097146
199977106
199891131
199795139
199691132
199582114
199485110
199383129
199278144
1991115177
1990128181
1989117180
1988114150
1987133183
1986115155
1985103140
1984110150
1983111164
1982101168
1981104145
198090128
197995148

When crashes happen on the A4146

Thursday has the most collisions on the A4146 (591), and 3pm to 6pm is the busiest time of day (770).

Collisions by day of the week

  • Monday473 (13%)
  • Tuesday517 (15%)
  • Wednesday466 (13%)
  • Thursday591 (17%)
  • Friday538 (15%)
  • Saturday537 (15%)
  • Sunday412 (12%)

Collisions by time of day

  • Midnight to 3am137 (3.9%)
  • 3am to 6am72 (2%)
  • 6am to 9am561 (16%)
  • 9am to noon484 (14%)
  • Noon to 3pm554 (16%)
  • 3pm to 6pm770 (22%)
  • 6pm to 9pm574 (16%)
  • 9pm to midnight382 (11%)

Collisions by month

  • January293 (8.3%)
  • February264 (7.5%)
  • March275 (7.8%)
  • April252 (7.1%)
  • May304 (8.6%)
  • June294 (8.3%)
  • July323 (9.1%)
  • August236 (6.7%)
  • September301 (8.5%)
  • October320 (9.1%)
  • November342 (9.7%)
  • December330 (9.3%)

Light conditions at the time

  • Daylight2,441 (69%)
  • Dark, street lights lit700 (20%)
  • Dark, no street lighting331 (9.4%)
  • Dark, lighting unknown44 (1.2%)
  • Dark, street lights unlit15 (0.4%)
  • Not recorded3 (0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4146 crashes

On the A4146, 39% of collisions happened where the speed limit was 60 mph and 59% on a dry road surface.

Speed limit at the scene

  • 30 mph1,116 (32%)
  • 40 mph220 (6.2%)
  • 50 mph131 (3.7%)
  • 60 mph1,374 (39%)
  • 70 mph692 (20%)
  • Not recorded1 (under 0.1%)

Weather at the time

  • Fine, no high winds2,707 (77%)
  • Raining, no high winds521 (15%)
  • Fine with high winds72 (2%)
  • Raining with high winds50 (1.4%)
  • Other155 (4.4%)
  • Not recorded29 (0.8%)

Road surface

  • Dry2,091 (59%)
  • Wet or damp1,291 (37%)
  • Frost or ice110 (3.1%)
  • Snow18 (0.5%)
  • Other12 (0.3%)
  • Not recorded12 (0.3%)

Type of road

  • Single carriageway2,244 (63%)
  • Dual carriageway677 (19%)
  • Roundabout597 (17%)
  • One way street or slip road8 (0.2%)
  • Not recorded8 (0.2%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4146 crashes

Car occupants make up 70% of the people killed or injured on the A4146, followed by motorcyclists (12%).

Casualties by road user

  • Car occupant3,584 (70%)
  • Motorcyclist634 (12%)
  • Pedestrian302 (5.9%)
  • Cyclist230 (4.5%)
  • Van occupant180 (3.5%)
  • Goods vehicle occupant (over 3.5 tonnes)84 (1.6%)
  • Other124 (2.4%)
  • Not recorded1 (under 0.1%)

Vehicles involved

  • Car5,143 (75%)
  • Motorcycle631 (9.2%)
  • Van or goods vehicle up to 3.5 tonnes388 (5.7%)
  • Goods vehicle over 3.5 tonnes302 (4.4%)
  • Pedal cycle237 (3.5%)
  • Bus or coach45 (0.7%)
  • Other90 (1.3%)
  • Not recorded5 (0.1%)

Casualties by age

  • 0 to 596 (1.9%)
  • 6 to 10122 (2.4%)
  • 11 to 15238 (4.6%)
  • 16 to 20879 (17%)
  • 21 to 25816 (16%)
  • 26 to 351,093 (21%)
  • 36 to 45761 (15%)
  • 46 to 55513 (10%)
  • 56 to 65308 (6%)
  • 66 to 75163 (3.2%)
  • Over 7586 (1.7%)
  • Not recorded64 (1.2%)

Drivers, passengers and pedestrians

  • Driver or rider3,465 (67%)
  • Passenger1,372 (27%)
  • Pedestrian302 (5.9%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4146

Map of the 25 most recent crashes on the A4146

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

  • 25 crashes
  • Serious
  • Slight

A4146 crashes by council area

Collisions on the A4146 were recorded in 4 council areas. Milton Keynes has the most, with 1,102, followed by Dacorum (1,075) and Central Bedfordshire (705).

Collisions on the A4146 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stMilton Keynes1,1021,49315176
2ndDacorum1,0751,58527236
3rdCentral Bedfordshire7051,02923128
4thBuckinghamshire6431,02321144

A4146 crashes by town

Collisions on the A4146 were recorded in 6 towns and built-up areas, led by Leighton Buzzard (340) and Hemel Hempstead (277).

Recent crashes on the A4146

These are the 25 most recent collisions on the A4146, from 27 December 2024 to 27 December 2025.

Severity