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M25 J17 — Blackspot analysis Chorleywood & Rickmansworth

Blackspot · 85 combined incidents · On the M25 within 2 miles of J17

Wider area: counting every road within 3 miles — local streets, A-roads, everything — 383 collisions are on record, 1 of them fatal. That figure tracks how built-up the area is rather than the road, so it is context only and the score below does not use it.

85Police Collisions
0Fatal
15Serious
138Casualties
0NH Incidents
85Combined
UKTU Danger Score
76
out of 100
Worse than most

Ranked 136 of 554 UK junctions on record by recorded harm · 20 of 33 on the M25.

A ranking of our own records, not a risk-per-vehicle measure and not an official safety assessment. Collisions are weighted by outcome: one fatal counts for 50 slight collisions, one serious for 8.

📍 Each pin marks an actual police-recorded collision location · Zoom in and click for details

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76
out of 100
Worse

What the record shows

M25 J17 ranks 136 of 554 UK junctions on record — worse than 76% of them by recorded harm. Of the 85 collisions on record, 15 serious.

Serious: 15 (17.6%) Slight: 70 (82.4%) 85 collisions
Fatal 0 0%
Serious 15 17.6%
Slight 70 82.4%

When it happens

Is there a pattern in time?

Collisions by year6 years on record
6 20
17 21
19 22
17 23
15 24
11 25
By month
J
F
M
A
M
J
J
A
S
O
N
D
By dayBusiest: Friday
7 M
18 T
11 W
16 T
19 F
9 S
5 S

What was present

Conditions recorded by police at the scene — most commonly fine no high winds

Weather
Fine no high winds82%
Raining no high winds14%
Fine + high winds1%
Other1%
Snowing + high winds1%
Road surface
Dry66%
Wet or damp29%
Unknown5%
Light
Daylight68%
Darkness - lights lit31%
Darkness - lighting unknown1%
Speed limit where collisions occurred
30mph
1
40mph
1
50mph
2
60mph
1
70mph
80

Police collision records

Showing the 50 most recent of 85 DfT STATS19 police-recorded collisions on the M25 within 2 miles of J17. Click any record to expand full details.

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Data Sources: DfT STATS19 police-recorded collision data and National Highways incident data, both under Open Government Licence v3.0. This is historical DfT statistical data — not an official police report. Blackspot classification is algorithmic and not an official safety assessment. © 2026 UK Traffic Updates.

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