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CrashStats

B4635 accidents: crash map and statistics

Police recorded 129 collisions on the B4635 from 1992 to 2025, with 166 casualties. Of those crashes, 2 were fatal and 23 serious, and 2 people were killed.

In 2025 there was 1 collision on the B4635, level with 2024, with 1 casualty.

Collisions since 1992
129
3,770th highest of 4,923 roads
Casualties
166
1.29 per collision
Fatal collisions
2
2 people killed
Serious collisions
23
25 seriously injured
Collisions in 2025
1
Level with 2024
Casualties in 2025
1
Level with 2024

Crash severity on the B4635

On the B4635, 1.6% of collisions were fatal and 18% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1992 to 2025

  • Fatal21.6%
  • Serious2318%
  • Slight10481%

Where the B4635 ranks among 4,923 roads

Most collisions
3,770th
Most casualties
3,832nd
Most fatal collisions
3,485th
Most serious collisions
3,899th

B4635 accidents by year

Collisions on the B4635 peaked at 9 in 1996 and were down to 1 in 2025.

Collisions and casualties on the B4635, 1992 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202411
202311
202211
202100
202011
201922
201811
201722
201622
201512
201424
201344
201267
201155
201033
200911
200879
200767
200645
200556
200448
200369
200244
200156
200045
199955
1998813
1997812
1996913
199559
199457
199322
199288

When crashes happen on the B4635

Friday has the most collisions on the B4635 (24), and 3pm to 6pm is the busiest time of day (34).

Collisions by day of the week

  • Monday19 (15%)
  • Tuesday18 (14%)
  • Wednesday17 (13%)
  • Thursday20 (16%)
  • Friday24 (19%)
  • Saturday13 (10%)
  • Sunday18 (14%)

Collisions by time of day

  • Midnight to 3am2 (1.6%)
  • 3am to 6am2 (1.6%)
  • 6am to 9am21 (16%)
  • 9am to noon23 (18%)
  • Noon to 3pm22 (17%)
  • 3pm to 6pm34 (26%)
  • 6pm to 9pm16 (12%)
  • 9pm to midnight9 (7%)

Collisions by month

  • January9 (7%)
  • February13 (10%)
  • March11 (8.5%)
  • April5 (3.9%)
  • May8 (6.2%)
  • June12 (9.3%)
  • July11 (8.5%)
  • August8 (6.2%)
  • September11 (8.5%)
  • October15 (12%)
  • November15 (12%)
  • December11 (8.5%)

Light conditions at the time

  • Daylight95 (74%)
  • Dark, street lights lit32 (25%)
  • Dark, lighting unknown1 (0.8%)
  • Dark, street lights unlit1 (0.8%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4635 crashes

On the B4635, 75% of collisions happened where the speed limit was 30 mph and 64% on a dry road surface.

Speed limit at the scene

  • 20 mph3 (2.3%)
  • 30 mph97 (75%)
  • 40 mph1 (0.8%)
  • 60 mph28 (22%)

Weather at the time

  • Fine, no high winds110 (85%)
  • Raining, no high winds18 (14%)
  • Other1 (0.8%)

Road surface

  • Dry82 (64%)
  • Wet or damp45 (35%)
  • Frost or ice2 (1.6%)

Type of road

  • Single carriageway116 (90%)
  • Roundabout10 (7.8%)
  • Dual carriageway3 (2.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4635 crashes

Car occupants make up 53% of the people killed or injured on the B4635, followed by pedestrians (19%).

Casualties by road user

  • Car occupant88 (53%)
  • Pedestrian31 (19%)
  • Cyclist26 (16%)
  • Motorcyclist9 (5.4%)
  • Van occupant6 (3.6%)
  • Bus or coach occupant1 (0.6%)
  • E-scooter or powered transporter user1 (0.6%)
  • Other4 (2.4%)

Vehicles involved

  • Car159 (70%)
  • Pedal cycle27 (12%)
  • Van or goods vehicle up to 3.5 tonnes13 (5.8%)
  • Motorcycle11 (4.9%)
  • Bus or coach6 (2.7%)
  • Goods vehicle over 3.5 tonnes5 (2.2%)
  • Other vehicle2 (0.9%)
  • Other3 (1.3%)

Casualties by age

  • 0 to 55 (3%)
  • 6 to 102 (1.2%)
  • 11 to 1512 (7.2%)
  • 16 to 2023 (14%)
  • 21 to 2517 (10%)
  • 26 to 3523 (14%)
  • 36 to 4535 (21%)
  • 46 to 5518 (11%)
  • 56 to 6513 (7.8%)
  • 66 to 757 (4.2%)
  • Over 7510 (6%)
  • Not recorded1 (0.6%)

Drivers, passengers and pedestrians

  • Driver or rider103 (62%)
  • Passenger32 (19%)
  • Pedestrian31 (19%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4635

Map of the 25 most recent crashes on the B4635

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

  • 25 crashes
  • Serious
  • Slight

B4635 crashes by council area

Of the 129 collisions on the B4635, 127 were in Dacorum.

Collisions on the B4635 in each area, 1992 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stDacorum127164223

B4635 crashes by town

Of the 129 collisions on the B4635, 87 were in the built-up area of Tring.

Recent crashes on the B4635

These are the 25 most recent collisions on the B4635, from 26 March 2012 to 16 May 2025.

Severity