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CrashStats

Treharris road accidents: crash map and statistics

Police recorded 265 road traffic collisions in Treharris, Merthyr Tydfil, from 1979 to 2025, and 365 people were killed or injured in them. Of those collisions, 3 were fatal and 39 were serious.

In 2025 police recorded 1 collision, up from none in 2024.

Collisions since 1979
265
1,674th of 2,851 towns, highest first
Casualties
365
1.38 per collision
Fatal collisions
3
3 people killed
Serious collisions
39
50 seriously injured
Collisions in 2025
1
0 in 2024
Casualties in 2025
1
0 in 2024

Road collision statistics for Treharris

Collisions by severity, 1979 to 2025

  • Fatal31.1%
  • Serious3915%
  • Slight22384%

What the data shows

  • Treharris had 18 collisions from 2016 to 2025, 65% fewer than the 51 from 2006 to 2015.
  • 16% of collisions in Treharris were fatal or serious, against 20% across Great Britain.
  • 73 children under 16 were killed or injured in Treharris, 20% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 33% of collisions in Treharris.

Where Treharris ranks among 2,851 towns

Most collisions
1,674th
Most casualties
1,604th
Most fatal collisions
1,791st
Most serious collisions
1,999th

Collisions by day of the week

  • Monday37 (14%)
  • Tuesday32 (12%)
  • Wednesday45 (17%)
  • Thursday43 (16%)
  • Friday43 (16%)
  • Saturday41 (15%)
  • Sunday24 (9.1%)

Light conditions

  • Daylight199 (75%)
  • Dark, street lights lit50 (19%)
  • Dark, no street lighting8 (3%)
  • Dark, lighting unknown6 (2.3%)
  • Dark, street lights unlit2 (0.8%)

Type of road

  • Single carriageway245 (92%)
  • One way street or slip road9 (3.4%)
  • Dual carriageway4 (1.5%)
  • Roundabout2 (0.8%)
  • Not recorded5 (1.9%)

Speed limit at the scene

  • 10 mph1 (0.4%)
  • 20 mph4 (1.5%)
  • 30 mph249 (94%)
  • 60 mph8 (3%)
  • 70 mph3 (1.1%)

Weather at the time

  • Fine, no high winds203 (77%)
  • Raining, no high winds40 (15%)
  • Raining with high winds5 (1.9%)
  • Fine with high winds3 (1.1%)
  • Snowing, no high winds2 (0.8%)
  • Fog or mist1 (0.4%)
  • Snowing with high winds1 (0.4%)
  • Other4 (1.5%)
  • Not recorded6 (2.3%)

Who was hurt

  • Car occupant172 (47%)
  • Pedestrian100 (27%)
  • Bus or coach occupant38 (10%)
  • Motorcyclist24 (6.6%)
  • Cyclist21 (5.8%)
  • Van occupant6 (1.6%)
  • Goods vehicle occupant (over 3.5 tonnes)3 (0.8%)
  • Other vehicle occupant1 (0.3%)

Source: Department for Transport, STATS19 road safety data

Treharris road accidents by year

Collisions and casualties in Treharris, 1979 to 2025

Collisions in Treharris peaked at 14 in 1984; 2025 had 1.

  • Collisions
  • Collisions in 2025: 1
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202511
202400
202312
202222
202122
202011
201922
201822
201722
201655
201511
201456
201334
201255
2011713
2010713
200946
200878
200757
2006711
200566
200458
200333
2002910
2001713
20001024
199934
1998713
199745
199678
19951014
199444
1993712
199246
1991810
199078
198967
19881218
198756
1986810
198533
19841416
19831114
1982810
19811321
1980610
197999

Map of recent crashes in Treharris

Map of the 24 most recent crashes in Treharris

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

  • 24 crashes
  • Serious
  • Slight

Recent road crashes in Treharris

The 24 most recent collisions in Treharris happened between 26 May 2014 and 20 December 2025.

Severity

Crashes by road in Treharris

The A4054 has the most collisions in Treharris, 49 of 265 (18%), followed by the B4254 (42).

Collisions in Treharris on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stA40544969211
2ndB4254425503
3rdA470284307

Council areas covering Treharris

Collisions in Treharris were recorded in 2 council areas. Merthyr Tydfil has 260 of 265 (98%).

Collisions in Treharris by council area, 1979 to 2025
RankCouncil areaCollisionsCasualtiesFatalSerious
1stMerthyr Tydfil260359338
2ndRhondda Cynon Taf5601

Postcode district for Treharris

All 265 collisions in Treharris were in the CF46 postcode district.