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CrashStats

B4623 accidents: crash map and statistics

Police recorded 213 collisions on the B4623 from 1998 to 2025, with 281 casualties. Of those crashes, 1 was fatal and 31 serious, and 1 person was killed.

In 2025 there was 1 collision on the B4623, level with 2024, with 1 casualty.

Collisions since 1998
213
3,163rd highest of 4,923 roads
Casualties
281
1.32 per collision
Fatal collisions
1
1 person killed
Serious collisions
31
34 seriously injured
Collisions in 2025
1
Level with 2024
Casualties in 2025
1
Down 67% on 2024

Crash severity on the B4623

On the B4623, 0.5% of collisions were fatal and 15% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1998 to 2025

  • Fatal10.5%
  • Serious3115%
  • Slight18185%

Where the B4623 ranks among 4,923 roads

Most collisions
3,163rd
Most casualties
3,205th
Most fatal collisions
3,933rd
Most serious collisions
3,580th

B4623 accidents by year

Collisions on the B4623 peaked at 23 in 2004 and were down to 1 in 2025.

Collisions and casualties on the B4623, 1998 to 2025

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202413
202300
202200
202100
202000
201900
201800
201700
201600
201500
201400
201300
201200
201122
201057
200967
20081621
20071619
20062229
20051116
20042333
20031929
20021723
20011418
20001920
19992325
19981828

When crashes happen on the B4623

Friday has the most collisions on the B4623 (38), and noon to 3pm is the busiest time of day (56).

Collisions by day of the week

  • Monday29 (14%)
  • Tuesday37 (17%)
  • Wednesday27 (13%)
  • Thursday28 (13%)
  • Friday38 (18%)
  • Saturday36 (17%)
  • Sunday18 (8.5%)

Collisions by time of day

  • Midnight to 3am14 (6.6%)
  • 3am to 6am2 (0.9%)
  • 6am to 9am18 (8.5%)
  • 9am to noon34 (16%)
  • Noon to 3pm56 (26%)
  • 3pm to 6pm50 (23%)
  • 6pm to 9pm24 (11%)
  • 9pm to midnight15 (7%)

Collisions by month

  • January16 (7.5%)
  • February15 (7%)
  • March22 (10%)
  • April18 (8.5%)
  • May10 (4.7%)
  • June18 (8.5%)
  • July24 (11%)
  • August16 (7.5%)
  • September21 (9.9%)
  • October21 (9.9%)
  • November17 (8%)
  • December15 (7%)

Light conditions at the time

  • Daylight165 (77%)
  • Dark, street lights lit45 (21%)
  • Dark, street lights unlit2 (0.9%)
  • Dark, lighting unknown1 (0.5%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4623 crashes

On the B4623, 92% of collisions happened where the speed limit was 30 mph and 67% on a dry road surface.

Speed limit at the scene

  • 20 mph2 (0.9%)
  • 30 mph197 (92%)
  • 40 mph2 (0.9%)
  • 60 mph12 (5.6%)

Weather at the time

  • Fine, no high winds166 (78%)
  • Raining, no high winds30 (14%)
  • Raining with high winds3 (1.4%)
  • Snowing, no high winds2 (0.9%)
  • Other10 (4.7%)
  • Not recorded2 (0.9%)

Road surface

  • Dry142 (67%)
  • Wet or damp65 (31%)
  • Frost or ice5 (2.3%)
  • Snow1 (0.5%)

Type of road

  • Single carriageway152 (71%)
  • One way street or slip road57 (27%)
  • Dual carriageway2 (0.9%)
  • Roundabout2 (0.9%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4623 crashes

Car occupants make up 59% of the people killed or injured on the B4623, followed by pedestrians (28%).

Casualties by road user

  • Car occupant167 (59%)
  • Pedestrian80 (28%)
  • Cyclist13 (4.6%)
  • Bus or coach occupant8 (2.8%)
  • Motorcyclist5 (1.8%)
  • Other vehicle occupant3 (1.1%)
  • Taxi or private hire car occupant2 (0.7%)
  • Other3 (1.1%)

Vehicles involved

  • Car297 (83%)
  • Bus or coach14 (3.9%)
  • Pedal cycle14 (3.9%)
  • Van or goods vehicle up to 3.5 tonnes9 (2.5%)
  • Motorcycle8 (2.2%)
  • Other vehicle6 (1.7%)
  • Goods vehicle over 3.5 tonnes5 (1.4%)
  • Taxi or private hire car4 (1.1%)

Casualties by age

  • 6 to 106 (2.1%)
  • 11 to 1527 (9.6%)
  • 16 to 2055 (20%)
  • 21 to 2534 (12%)
  • 26 to 3547 (17%)
  • 36 to 4542 (15%)
  • 46 to 5531 (11%)
  • 56 to 6518 (6.4%)
  • 66 to 7511 (3.9%)
  • Over 7510 (3.6%)

Drivers, passengers and pedestrians

  • Driver or rider120 (43%)
  • Passenger81 (29%)
  • Pedestrian80 (28%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4623

Map of the 25 most recent crashes on the B4623

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

  • 25 crashes
  • Serious
  • Slight

B4623 crashes by council area

Collisions on the B4623 were recorded in 2 council areas. Caerphilly has the most, with 190, followed by Cardiff (23).

Collisions on the B4623 in each area, 1998 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stCaerphilly190251130
2ndCardiff233001

B4623 crashes by town

Collisions on the B4623 were recorded in 2 towns and built-up areas, led by Caerphilly (179) and Cardiff (19).

Recent crashes on the B4623

These are the 25 most recent collisions on the B4623, from 6 May 2008 to 17 July 2025.

Severity