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CrashStats

A4059 accidents: crash map and statistics

Police recorded 1,746 collisions on the A4059 from 1979 to 2025, with 2,662 casualties. Of those crashes, 51 were fatal and 303 serious, and 55 people were killed.

In 2025 there were 17 collisions on the A4059, up 70% from 10 in 2024, with 28 casualties.

Collisions since 1979
1,746
660th highest of 4,923 roads
Casualties
2,662
1.52 per collision
Fatal collisions
51
55 people killed
Serious collisions
303
384 seriously injured
Collisions in 2025
17
Up 70% on 2024
Casualties in 2025
28
Up 115% on 2024

Crash severity on the A4059

On the A4059, 2.9% of collisions were fatal and 17% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal512.9%
  • Serious30317%
  • Slight1,39280%

Where the A4059 ranks among 4,923 roads

Most collisions
660th
Most casualties
592nd
Most fatal collisions
405th
Most serious collisions
702nd

A4059 accidents by year

Collisions on the A4059 peaked at 72 in 1981 and were down to 17 in 2025.

Collisions and casualties on the A4059, 1979 to 2025

  • Collisions
  • Collisions in 2025: 17
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20251728
20241013
20232748
20221624
20211727
20201729
20191420
20182338
20171923
20162233
20152244
20142336
20132740
20123062
20113969
20102034
20092644
20083661
20074177
20064371
20054280
20044570
20035086
20022334
20012950
20002443
19992736
19982232
19974252
19964571
19954252
19943963
19934582
19925168
19913955
19904563
19895979
198857100
19876291
19866083
19855775
19844449
19835978
19826785
198172117
19805363
19795784

When crashes happen on the A4059

Friday has the most collisions on the A4059 (293), and 3pm to 6pm is the busiest time of day (428).

Collisions by day of the week

  • Monday247 (14%)
  • Tuesday237 (14%)
  • Wednesday233 (13%)
  • Thursday250 (14%)
  • Friday293 (17%)
  • Saturday267 (15%)
  • Sunday219 (13%)

Collisions by time of day

  • Midnight to 3am76 (4.4%)
  • 3am to 6am24 (1.4%)
  • 6am to 9am205 (12%)
  • 9am to noon254 (15%)
  • Noon to 3pm323 (18%)
  • 3pm to 6pm428 (25%)
  • 6pm to 9pm243 (14%)
  • 9pm to midnight193 (11%)

Collisions by month

  • January144 (8.2%)
  • February129 (7.4%)
  • March133 (7.6%)
  • April154 (8.8%)
  • May133 (7.6%)
  • June128 (7.3%)
  • July155 (8.9%)
  • August127 (7.3%)
  • September144 (8.2%)
  • October164 (9.4%)
  • November176 (10%)
  • December159 (9.1%)

Light conditions at the time

  • Daylight1,214 (70%)
  • Dark, street lights lit261 (15%)
  • Dark, no street lighting180 (10%)
  • Dark, street lights unlit57 (3.3%)
  • Dark, lighting unknown31 (1.8%)
  • Not recorded3 (0.2%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A4059 crashes

On the A4059, 41% of collisions happened where the speed limit was 30 mph and 60% on a dry road surface.

Speed limit at the scene

  • 20 mph3 (0.2%)
  • 30 mph722 (41%)
  • 40 mph209 (12%)
  • 50 mph81 (4.6%)
  • 60 mph720 (41%)
  • 70 mph11 (0.6%)

Weather at the time

  • Fine, no high winds1,308 (75%)
  • Raining, no high winds274 (16%)
  • Raining with high winds79 (4.5%)
  • Fine with high winds19 (1.1%)
  • Other54 (3.1%)
  • Not recorded12 (0.7%)

Road surface

  • Dry1,051 (60%)
  • Wet or damp619 (35%)
  • Frost or ice43 (2.5%)
  • Snow19 (1.1%)
  • Flood over 3cm deep11 (0.6%)
  • Not recorded3 (0.2%)

Type of road

  • Single carriageway1,506 (86%)
  • Roundabout164 (9.4%)
  • Dual carriageway52 (3%)
  • One way street or slip road19 (1.1%)
  • Not recorded5 (0.3%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A4059 crashes

Car occupants make up 71% of the people killed or injured on the A4059, followed by pedestrians (11%).

Casualties by road user

  • Car occupant1,901 (71%)
  • Pedestrian284 (11%)
  • Motorcyclist187 (7%)
  • Van occupant82 (3.1%)
  • Cyclist64 (2.4%)
  • Bus or coach occupant53 (2%)
  • Goods vehicle occupant (over 3.5 tonnes)38 (1.4%)
  • Other53 (2%)

Vehicles involved

  • Car2,420 (78%)
  • Motorcycle189 (6.1%)
  • Van or goods vehicle up to 3.5 tonnes164 (5.3%)
  • Goods vehicle over 3.5 tonnes127 (4.1%)
  • Bus or coach78 (2.5%)
  • Pedal cycle64 (2%)
  • Other79 (2.5%)
  • Not recorded1 (under 0.1%)

Casualties by age

  • 0 to 548 (1.8%)
  • 6 to 1072 (2.7%)
  • 11 to 15142 (5.3%)
  • 16 to 20415 (16%)
  • 21 to 25407 (15%)
  • 26 to 35517 (19%)
  • 36 to 45389 (15%)
  • 46 to 55297 (11%)
  • 56 to 65215 (8.1%)
  • 66 to 75113 (4.2%)
  • Over 7545 (1.7%)
  • Not recorded2 (0.1%)

Drivers, passengers and pedestrians

  • Driver or rider1,536 (58%)
  • Passenger842 (32%)
  • Pedestrian284 (11%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A4059

Map of the 25 most recent crashes on the A4059

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

  • 25 crashes
  • Fatal
  • Serious
  • Slight

A4059 crashes by council area

Collisions on the A4059 were recorded in 5 council areas. Rhondda Cynon Taf has the most, with 1,682, followed by Powys (51) and Merthyr Tydfil (4).

Collisions on the A4059 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stRhondda Cynon Taf1,6822,57048275
2ndPowys5173324
3rdMerthyr Tydfil4701
4thCaerphilly3400
5thSouth Gloucestershire3502

A4059 crashes by town

Collisions on the A4059 were recorded in 3 towns and built-up areas, led by Aberdare (534) and Mountain Ash (199).

Recent crashes on the A4059

These are the 25 most recent collisions on the A4059, from 21 January 2024 to 26 December 2025.

Severity