Harpenden road traffic accidents
Harpenden recorded 806 collisions in the STATS19 data between 1999 and 2025, involving 991 casualties. Of these collisions, 6 were fatal and 114 were serious. Recorded collisions in 2025 were unchanged on 2024.
Severity Breakdown
- Fatal
- 6
- Serious
- 114
- Casualties
- 991
- Fatal
- 6
- Serious
- 114
- Casualties
- 991
Collisions by Year
Areas covering Harpenden
Roads in Harpenden
Postcode districts in Harpenden
Planning applications nearby
Data from PlanIndex, an index of UK planning registers.
Data from PlanIndex, an index of UK planning registers.
Accidents in Harpenden
Road collision statistics for Harpenden
Collisions recorded
806
Police-reported road traffic collisions captured in the STATS19 data.
People injured or killed
991
Casualties recorded across every collision in this area.
Fatal collisions
6
Collisions in which at least one person died.
Serious collisions
114
14.9% of collisions here ended in a death or serious injury.
Severity of collisions
What the data shows in Harpenden
Collisions in Harpenden are most frequently recorded on a Friday (17.9% of the total), with 26.6% happening in darkness rather than daylight. The most common posted speed limit at the scene is 30 mph.
88% of recorded collisions in Harpenden happen on a single carriageway. Around 19.7% were recorded in adverse weather such as rain, snow or fog.
The collisions in Harpenden have produced 991 casualties. Pedestrians account for 18.6% 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 78 collisions, Monday 125 collisions, Tuesday 124 collisions, Wednesday 129 collisions, Thursday 124 collisions, Friday 144 collisions, Saturday 82 collisions.
Light conditions
Light conditions: Daylight 592 collisions, Darkness 214 collisions.
Road type
Road type: Single carriageway 709 collisions, Roundabout 75 collisions, One way street 10 collisions, Unknown 5 collisions, One way street/Slip road 5 collisions, Dual carriageway 2 collisions.
Speed limit at the scene
Speed limit at the scene: 20 mph 9 collisions, 30 mph 744 collisions, 40 mph 44 collisions, 60 mph 9 collisions.
Weather at the time
Weather at the time: Fine no high winds 647 collisions, Raining no high winds 102 collisions, Other 24 collisions, Raining + high winds 11 collisions, Unknown 9 collisions.
Who was hurt
Who was hurt: Driver or rider 652 casualties, Passenger 155 casualties, Pedestrian 184 casualties.
Move Insights
Thinking of moving to this area?
Check flood risk, planning history, EPC ratings and more with a Move Insights property report.
Recent Accidents
Showing 6 of 806 accidents
Accident 19994100F0077
SlightAccident 19994100F0074
SlightAccident 19994100F0059
SlightAccident 19994100F0057
SlightAccident 19994100F0019
SlightAccident 19994100F0010
SlightFrequently asked questions about road accidents in Harpenden
How many road accidents have there been in Harpenden?
806 collisions have been recorded in Harpenden in the STATS19 road safety data between 1999 and 2025, involving 991 casualties.
How many of the collisions in Harpenden were serious or fatal?
6 were fatal and 114 were serious — 14.9% of all recorded collisions in Harpenden resulted in a death or serious injury.
When do most road accidents happen in Harpenden?
Friday is the most common day for collisions in Harpenden, accounting for 17.9% of them, and 26.6% of all collisions here happen in darkness.
What kind of roads do collisions in Harpenden happen on?
88% of collisions in Harpenden are recorded on a single carriageway, most often where the limit is 30 mph.
Are pedestrians often hurt in collisions in Harpenden?
Pedestrians make up 18.6% of the 991 casualties recorded in Harpenden.
Is road safety in Harpenden getting better or worse?
Recorded collisions in Harpenden were broadly unchanged in 2025 compared with 2024.
Where does the road accident data for Harpenden 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 Harpenden cover 1999 to 2025.