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CrashStats

Mountain Ash road accidents: crash map and statistics

Police recorded 973 road traffic collisions in Mountain Ash, Rhondda Cynon Taf, from 1979 to 2025, and 1,256 people were killed or injured in them. Of those collisions, 14 were fatal and 143 were serious.

In 2025 police recorded 7 collisions, up from 1 in 2024.

Collisions since 1979
973
773rd highest of 2,851 towns
Casualties
1,256
1.29 per collision
Fatal collisions
14
14 people killed
Serious collisions
143
165 seriously injured
Collisions in 2025
7
1 in 2024
Casualties in 2025
8
1 in 2024

Road collision statistics for Mountain Ash

Collisions by severity, 1979 to 2025

  • Fatal141.4%
  • Serious14315%
  • Slight81684%

What the data shows

  • Mountain Ash had 74 collisions from 2016 to 2025, 61% fewer than the 189 from 2006 to 2015.
  • 16% of collisions in Mountain Ash were fatal or serious, against 20% across Great Britain.
  • 308 children under 16 were killed or injured in Mountain Ash, 25% of the casualties whose age was recorded.
  • The road surface was wet, icy, snowy or flooded in 33% of collisions in Mountain Ash.

Where Mountain Ash ranks among 2,851 towns

Most collisions
773rd
Most casualties
760th
Most fatal collisions
669th
Most serious collisions
894th

Collisions by day of the week

  • Monday130 (13%)
  • Tuesday131 (13%)
  • Wednesday135 (14%)
  • Thursday131 (13%)
  • Friday178 (18%)
  • Saturday148 (15%)
  • Sunday120 (12%)

Light conditions

  • Daylight687 (71%)
  • Dark, street lights lit226 (23%)
  • Dark, no street lighting26 (2.7%)
  • Dark, street lights unlit21 (2.2%)
  • Dark, lighting unknown13 (1.3%)

Type of road

  • Single carriageway910 (94%)
  • One way street or slip road24 (2.5%)
  • Dual carriageway21 (2.2%)
  • Roundabout4 (0.4%)
  • Not recorded14 (1.4%)

Speed limit at the scene

  • 20 mph9 (0.9%)
  • 30 mph893 (92%)
  • 40 mph13 (1.3%)
  • 50 mph2 (0.2%)
  • 60 mph53 (5.4%)
  • 70 mph3 (0.3%)

Weather at the time

  • Fine, no high winds761 (78%)
  • Raining, no high winds145 (15%)
  • Raining with high winds21 (2.2%)
  • Fine with high winds15 (1.5%)
  • Snowing, no high winds6 (0.6%)
  • Fog or mist2 (0.2%)
  • Snowing with high winds2 (0.2%)
  • Other12 (1.2%)
  • Not recorded9 (0.9%)

Who was hurt

  • Car occupant615 (49%)
  • Pedestrian412 (33%)
  • Motorcyclist62 (4.9%)
  • Cyclist59 (4.7%)
  • Bus or coach occupant49 (3.9%)
  • Van occupant32 (2.5%)
  • Other vehicle occupant10 (0.8%)
  • Goods vehicle occupant (over 3.5 tonnes)9 (0.7%)
  • Minibus occupant3 (0.2%)
  • Taxi or private hire car occupant3 (0.2%)
  • Not recorded2 (0.2%)

Source: Department for Transport, STATS19 road safety data

Mountain Ash road accidents by year

Collisions and casualties in Mountain Ash, 1979 to 2025

Collisions in Mountain Ash peaked at 38 in 1982; 2025 had 7.

  • Collisions
  • Collisions in 2025: 7
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
202578
202411
20231117
202288
202146
202034
2019810
20181316
20171010
2016916
20151214
20141217
20131321
20121730
20112536
20101316
20091924
20082434
20072333
20063137
20051927
20042530
20032638
20022537
20011827
20002229
19992128
19981923
19973141
19962733
19952431
19942936
19932433
19922936
19912124
19902936
19892534
19883440
19872430
19862733
19852226
19841921
19833540
19823840
19813239
19802737
19793849

Map of recent crashes in Mountain Ash

Map of the 24 most recent crashes in Mountain Ash

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

  • 24 crashes
  • Fatal
  • Serious
  • Slight

Recent road crashes in Mountain Ash

The 24 most recent collisions in Mountain Ash happened between 31 August 2022 and 29 September 2025.

Severity

Crashes by road in Mountain Ash

The B4275 has the most collisions in Mountain Ash, 265 of 973 (27%), followed by the A4059 (199).

Collisions in Mountain Ash on each road, 1979 to 2025
RankRoadCollisionsCasualtiesFatalSerious
1stB4275265334239
2ndA4059199291538
3rdA4224354919
4thB42247901

Council area for Mountain Ash

Mountain Ash is in Rhondda Cynon Taf, where police recorded 26,648 collisions from 1979 to 2025. Mountain Ash accounts for 3.6% of them.

Postcode district for Mountain Ash

Of the 973 collisions in Mountain Ash, 971 (99.8%) were in the CF45 postcode district.