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CrashStats

B4599 accidents: crash map and statistics

Police recorded 314 collisions on the B4599 from 1980 to 2025, with 409 casualties. Of those crashes, 2 were fatal and 79 serious, and 2 people were killed.

In 2025 there were 4 collisions on the B4599, up 100% from 2 in 2024, with 7 casualties.

Collisions since 1980
314
2,627th highest of 4,923 roads
Casualties
409
1.30 per collision
Fatal collisions
2
2 people killed
Serious collisions
79
86 seriously injured
Collisions in 2025
4
Up 100% on 2024
Casualties in 2025
7
Up 250% on 2024

Crash severity on the B4599

On the B4599, 0.6% of collisions were fatal and 25% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1980 to 2025

  • Fatal20.6%
  • Serious7925%
  • Slight23374%

Where the B4599 ranks among 4,923 roads

Most collisions
2,627th
Most casualties
2,696th
Most fatal collisions
3,485th
Most serious collisions
2,301st

B4599 accidents by year

Collisions on the B4599 peaked at 14 in 1983 and were down to 4 in 2025.

Collisions and casualties on the B4599, 1980 to 2025

  • Collisions
  • Collisions in 2025: 4
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202547
202422
202357
202222
202111
202022
201935
2018710
201733
201611
201566
2014610
201346
201234
201133
20101011
200967
20081121
200768
2006913
200544
20041316
200367
2002810
20011014
200068
1999811
19981313
19971112
1996710
19951014
1994912
1993810
19921214
19911011
19901217
19891113
19881013
198755
1986712
198533
19841011
19831421
198222
1981915
198022

When crashes happen on the B4599

Friday has the most collisions on the B4599 (58), and 3pm to 6pm is the busiest time of day (68).

Collisions by day of the week

  • Monday40 (13%)
  • Tuesday40 (13%)
  • Wednesday49 (16%)
  • Thursday45 (14%)
  • Friday58 (18%)
  • Saturday47 (15%)
  • Sunday35 (11%)

Collisions by time of day

  • Midnight to 3am12 (3.8%)
  • 3am to 6am5 (1.6%)
  • 6am to 9am28 (8.9%)
  • 9am to noon52 (17%)
  • Noon to 3pm60 (19%)
  • 3pm to 6pm68 (22%)
  • 6pm to 9pm58 (18%)
  • 9pm to midnight31 (9.9%)

Collisions by month

  • January36 (11%)
  • February25 (8%)
  • March24 (7.6%)
  • April19 (6.1%)
  • May29 (9.2%)
  • June28 (8.9%)
  • July23 (7.3%)
  • August28 (8.9%)
  • September33 (11%)
  • October22 (7%)
  • November19 (6.1%)
  • December28 (8.9%)

Light conditions at the time

  • Daylight216 (69%)
  • Dark, street lights lit93 (30%)
  • Dark, lighting unknown2 (0.6%)
  • Dark, street lights unlit2 (0.6%)
  • Dark, no street lighting1 (0.3%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in B4599 crashes

On the B4599, 96% of collisions happened where the speed limit was 30 mph and 55% on a dry road surface.

Speed limit at the scene

  • 20 mph6 (1.9%)
  • 30 mph303 (96%)
  • 50 mph1 (0.3%)
  • 60 mph4 (1.3%)

Weather at the time

  • Fine, no high winds206 (66%)
  • Raining, no high winds80 (25%)
  • Raining with high winds8 (2.5%)
  • Snowing, no high winds2 (0.6%)
  • Other16 (5.1%)
  • Not recorded2 (0.6%)

Road surface

  • Dry174 (55%)
  • Wet or damp129 (41%)
  • Frost or ice10 (3.2%)
  • Snow1 (0.3%)

Type of road

  • Single carriageway301 (96%)
  • Roundabout7 (2.2%)
  • Dual carriageway5 (1.6%)
  • One way street or slip road1 (0.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in B4599 crashes

Car occupants make up 62% of the people killed or injured on the B4599, followed by pedestrians (19%).

Casualties by road user

  • Car occupant252 (62%)
  • Pedestrian78 (19%)
  • Motorcyclist35 (8.6%)
  • Cyclist22 (5.4%)
  • Bus or coach occupant6 (1.5%)
  • Taxi or private hire car occupant5 (1.2%)
  • Van occupant5 (1.2%)
  • Other6 (1.5%)

Vehicles involved

  • Car456 (81%)
  • Motorcycle38 (6.7%)
  • Pedal cycle22 (3.9%)
  • Van or goods vehicle up to 3.5 tonnes17 (3%)
  • Bus or coach9 (1.6%)
  • Goods vehicle over 3.5 tonnes8 (1.4%)
  • Other vehicle5 (0.9%)
  • Other10 (1.8%)

Casualties by age

  • 0 to 511 (2.7%)
  • 6 to 1014 (3.4%)
  • 11 to 1535 (8.6%)
  • 16 to 2083 (20%)
  • 21 to 2554 (13%)
  • 26 to 3572 (18%)
  • 36 to 4534 (8.3%)
  • 46 to 5536 (8.8%)
  • 56 to 6527 (6.6%)
  • 66 to 7527 (6.6%)
  • Over 7516 (3.9%)

Drivers, passengers and pedestrians

  • Driver or rider230 (56%)
  • Passenger101 (25%)
  • Pedestrian78 (19%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the B4599

Map of the 25 most recent crashes on the B4599

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

B4599 crashes by council area

Collisions on the B4599 were recorded in 2 council areas. Powys has the most, with 300, followed by Neath Port Talbot (13).

Collisions on the B4599 in each area, 1980 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stPowys300392274
2ndNeath Port Talbot131605

B4599 crashes by town

Collisions on the B4599 were recorded in 2 towns and built-up areas, led by Ystalyfera (152) and Ystradgynlais (138).

Recent crashes on the B4599

These are the 25 most recent collisions on the B4599, from 23 February 2018 to 17 June 2025.

Severity