M4 postcode district road traffic accidents
The M4 postcode district recorded 1,248 collisions in the STATS19 data between 1999 and 2024, involving 1,748 casualties. Of these collisions, 16 were fatal and 145 were serious. Recorded collisions in 2024 were down 14% on 2023.
Severity Breakdown
- Fatal
- 16
- Serious
- 145
- Casualties
- 1,748
- Fatal
- 16
- Serious
- 145
- Casualties
- 1,748
Collisions by Year
Areas covering M4
Towns in M4
Roads in M4
Accidents in the M4 postcode district
Road collision statistics for the M4 postcode district
Collisions recorded
1,248
Police-reported road traffic collisions captured in the STATS19 data.
People injured or killed
1,748
Casualties recorded across every collision in this area.
Fatal collisions
16
Collisions in which at least one person died.
Serious collisions
145
12.9% of collisions here ended in a death or serious injury.
Severity of collisions
What the data shows in the M4 postcode district
Collisions in the M4 postcode district are most frequently recorded on a Saturday (15.6% of the total), with 33.4% happening in darkness rather than daylight. The most common posted speed limit at the scene is 30 mph.
57.5% of recorded collisions in the M4 postcode district happen on a single carriageway. Around 22.4% were recorded in adverse weather such as rain, snow or fog.
The collisions in the M4 postcode district have produced 1,748 casualties. Pedestrians account for 28.4% of those casualties, a marker of the risk to people on foot here.
Collisions by day of the week
Collisions by day of the week: Sunday 167 collisions, Monday 174 collisions, Tuesday 158 collisions, Wednesday 191 collisions, Thursday 177 collisions, Friday 186 collisions, Saturday 195 collisions.
Light conditions
Light conditions: Daylight 831 collisions, Darkness 417 collisions.
Road type
Road type: Single carriageway 717 collisions, Dual carriageway 208 collisions, One way street 172 collisions, Other 112 collisions, Unknown 36 collisions, Slip road 3 collisions.
Speed limit at the scene
Speed limit at the scene: 20 mph 132 collisions, 30 mph 1,115 collisions, 40 mph 1 collisions.
Weather at the time
Weather at the time: Fine no high winds 968 collisions, Raining no high winds 189 collisions, Unknown 29 collisions, Raining + high winds 25 collisions, Other 23 collisions.
Who was hurt
Who was hurt: Driver or rider 679 casualties, Passenger 573 casualties, Pedestrian 496 casualties.
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Recent Accidents
Showing 20 of 1,248 accidents
Accident 201806A147401
SlightAccident 201806A147129
SlightAccident 201806A147616
SlightAccident 201806A145574
SlightAccident 201806A344511
SlightAccident 201806A143643
SlightAccident 201806A143943
SlightAccident 201806A142806
SeriousAccident 201806A142403
SeriousAccident 201806A142275
SlightAccident 201806A341501
SlightAccident 201806A341242
SlightAccident 201806A140139
SeriousAccident 201806A141328
SlightAccident 201806A339989
SlightAccident 201806A239652
SlightAccident 201806A339475
SlightAccident 201806A140635
SlightAccident 201706A038463
SlightAccident 201706A038382
SlightFrequently asked questions about road accidents in the M4 postcode district
How many road accidents have there been in the M4 postcode district?
1,248 collisions have been recorded in the M4 postcode district in the STATS19 road safety data between 1999 and 2024, involving 1,748 casualties.
How many of the collisions in the M4 postcode district were serious or fatal?
16 were fatal and 145 were serious — 12.9% of all recorded collisions in the M4 postcode district resulted in a death or serious injury.
When do most road accidents happen in the M4 postcode district?
Saturday is the most common day for collisions in the M4 postcode district, accounting for 15.6% of them, and 33.4% of all collisions here happen in darkness.
What kind of roads do collisions in the M4 postcode district happen on?
57.5% of collisions in the M4 postcode district are recorded on a single carriageway, most often where the limit is 30 mph.
Are pedestrians often hurt in collisions in the M4 postcode district?
Pedestrians make up 28.4% of the 1,748 casualties recorded in the M4 postcode district.
Is road safety in the M4 postcode district getting better or worse?
Recorded collisions in the M4 postcode district fell 14% in 2024 compared with 2023, though year-on-year figures move with both genuine risk and changes in reporting.
Where does the road accident data for the M4 postcode district come from?
It comes from STATS19, the official record of personal-injury road collisions reported to the police and published by the Department for Transport. The figures for the M4 postcode district cover 1999 to 2024.