Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Tue 1 Jan 1985 | Watford | 3 | 3 | Slight |
| Fri 4 Jan 1985 | Barnet | 2 | 1 | Slight |
| Wed 9 Jan 1985 | Hertsmere | 2 | 1 | Serious |
| Thu 10 Jan 1985 | Watford | 2 | 1 | Slight |
| Sat 12 Jan 1985 | Watford | 1 | 1 | Slight |
| Mon 14 Jan 1985 | Hertsmere | 2 | 1 | Slight |
| Tue 15 Jan 1985 | Barnet | 1 | 1 | Slight |
| Tue 15 Jan 1985 | Watford | 2 | 1 | Slight |
| Tue 15 Jan 1985 | Watford | 2 | 1 | Slight |
| Tue 15 Jan 1985 | Watford | 2 | 1 | Slight |
| Tue 15 Jan 1985 | Watford | 2 | 1 | Slight |
| Thu 17 Jan 1985 | Barnet | 1 | 1 | Slight |
| Sat 19 Jan 1985 | Barnet | 2 | 1 | Slight |
| Mon 21 Jan 1985 | Watford | 1 | 1 | Slight |
| Thu 24 Jan 1985 | Watford | 2 | 1 | Slight |
| Thu 24 Jan 1985 | Watford | 2 | 3 | Serious |
| Fri 8 Feb 1985 | Watford | 2 | 1 | Slight |
| Sun 10 Feb 1985 | Watford | 4 | 3 | Fatal |
| Wed 13 Feb 1985 | Hertsmere | 1 | 1 | Slight |
| Sat 16 Feb 1985 | Watford | 1 | 4 | Serious |
| Thu 21 Feb 1985 | Barnet | 2 | 1 | Slight |
| Thu 21 Feb 1985 | Hertsmere | 3 | 1 | Slight |
| Tue 26 Feb 1985 | Hertsmere | 1 | 1 | Serious |
| Thu 28 Feb 1985 | Barnet | 3 | 2 | Slight |
| Thu 28 Feb 1985 | Barnet | 2 | 1 | Slight |
| Fri 1 Mar 1985 | Watford | 2 | 1 | Slight |
| Sat 2 Mar 1985 | Watford | 1 | 1 | Slight |
| Sat 2 Mar 1985 | Watford | 1 | 1 | Slight |
| Sat 2 Mar 1985 | Barnet | 1 | 2 | Serious |
| Sat 2 Mar 1985 | Watford | 1 | 1 | Serious |
| Sun 3 Mar 1985 | Watford | 2 | 1 | Slight |
| Sat 9 Mar 1985 | Barnet | 3 | 1 | Slight |
| Sun 10 Mar 1985 | Watford | 2 | 1 | Slight |
| Wed 13 Mar 1985 | Barnet | 1 | 1 | Slight |
| Wed 13 Mar 1985 | Hertsmere | 2 | 1 | Slight |
| Wed 13 Mar 1985 | Watford | 2 | 1 | Slight |
| Thu 14 Mar 1985 | Hertsmere | 2 | 1 | Slight |
| Fri 15 Mar 1985 | Barnet | 2 | 2 | Serious |
| Fri 15 Mar 1985 | Watford | 1 | 3 | Serious |
| Sun 17 Mar 1985 | Watford | 1 | 4 | Serious |
| Wed 27 Mar 1985 | Barnet | 2 | 2 | Slight |
| Sat 30 Mar 1985 | Watford | 2 | 1 | Slight |
| Mon 1 Apr 1985 | Watford | 2 | 1 | Slight |
| Tue 2 Apr 1985 | Three Rivers | 2 | 1 | Slight |
| Fri 5 Apr 1985 | Hertsmere | 2 | 1 | Serious |
| Sat 6 Apr 1985 | Watford | 1 | 1 | Serious |
| Wed 10 Apr 1985 | Watford | 2 | 1 | Serious |
| Thu 11 Apr 1985 | Watford | 1 | 1 | Slight |
| Fri 12 Apr 1985 | Barnet | 2 | 1 | Slight |
| Fri 12 Apr 1985 | Barnet | 2 | 1 | Serious |
| Sat 13 Apr 1985 | Hertsmere | 1 | 6 | Serious |
| Mon 15 Apr 1985 | Hertsmere | 1 | 1 | Serious |
| Tue 16 Apr 1985 | Barnet | 1 | 1 | Slight |
| Wed 17 Apr 1985 | Watford | 2 | 1 | Slight |
| Wed 17 Apr 1985 | Barnet | 1 | 2 | Serious |
| Thu 18 Apr 1985 | Barnet | 2 | 1 | Serious |
| Thu 18 Apr 1985 | Barnet | 2 | 1 | Serious |
| Sun 21 Apr 1985 | Barnet | 2 | 1 | Slight |
| Tue 23 Apr 1985 | Barnet | 3 | 1 | Slight |
| Fri 26 Apr 1985 | Barnet | 2 | 1 | Serious |
| Fri 26 Apr 1985 | Watford | 1 | 1 | Serious |
| Sat 27 Apr 1985 | Watford | 2 | 1 | Slight |
| Sat 27 Apr 1985 | Watford | 1 | 1 | Slight |
| Wed 1 May 1985 | Hertsmere | 2 | 1 | Slight |
| Thu 2 May 1985 | Hertsmere | 1 | 1 | Slight |
| Mon 6 May 1985 | Barnet | 1 | 1 | Slight |
| Mon 6 May 1985 | Watford | 1 | 1 | Serious |
| Tue 7 May 1985 | Hertsmere | 1 | 1 | Slight |
| Fri 10 May 1985 | Barnet | 2 | 1 | Slight |
| Mon 13 May 1985 | Hertsmere | 1 | 1 | Fatal |
| Tue 14 May 1985 | Watford | 2 | 3 | Slight |
| Sat 18 May 1985 | Hertsmere | 2 | 2 | Slight |
| Sun 19 May 1985 | Hertsmere | 2 | 1 | Slight |
| Wed 22 May 1985 | Watford | 2 | 1 | Serious |
| Sat 25 May 1985 | Three Rivers | 2 | 2 | Slight |
| Mon 27 May 1985 | Watford | 1 | 1 | Slight |
| Tue 28 May 1985 | Barnet | 3 | 3 | Slight |
| Wed 29 May 1985 | Three Rivers | 2 | 1 | Slight |
| Thu 30 May 1985 | Barnet | 2 | 1 | Slight |
| Fri 31 May 1985 | Hertsmere | 1 | 1 | Serious |
| Tue 4 Jun 1985 | Hertsmere | 2 | 1 | Serious |
| Tue 4 Jun 1985 | Hertsmere | 2 | 1 | Slight |
| Tue 4 Jun 1985 | Barnet | 2 | 2 | Serious |
| Fri 7 Jun 1985 | Hertsmere | 1 | 1 | Slight |
| Sat 8 Jun 1985 | Hertsmere | 1 | 1 | Serious |
| Sun 9 Jun 1985 | Hertsmere | 3 | 1 | Serious |
| Tue 11 Jun 1985 | Barnet | 2 | 1 | Slight |
| Tue 11 Jun 1985 | Barnet | 2 | 1 | Slight |
| Wed 12 Jun 1985 | Barnet | 1 | 1 | Slight |
| Wed 12 Jun 1985 | Watford | 2 | 1 | Slight |
| Thu 13 Jun 1985 | Hertsmere | 1 | 1 | Slight |
| Fri 14 Jun 1985 | Watford | 1 | 2 | Slight |
| Fri 21 Jun 1985 | Hertsmere | 2 | 2 | Serious |
| Fri 21 Jun 1985 | Hertsmere | 2 | 1 | Slight |
| Sat 22 Jun 1985 | Barnet | 2 | 1 | Slight |
| Sat 22 Jun 1985 | Hertsmere | 3 | 4 | Serious |
| Mon 24 Jun 1985 | Barnet | 1 | 1 | Slight |
| Mon 24 Jun 1985 | Hertsmere | 2 | 1 | Serious |
| Mon 24 Jun 1985 | Hertsmere | 2 | 1 | Slight |
| Thu 27 Jun 1985 | Barnet | 2 | 1 | Slight |
| Thu 27 Jun 1985 | Watford | 1 | 2 | Serious |
| Fri 28 Jun 1985 | Watford | 2 | 1 | Slight |
| Sun 30 Jun 1985 | Hertsmere | 2 | 1 | Slight |
| Mon 1 Jul 1985 | Hertsmere | 2 | 1 | Slight |
| Sun 7 Jul 1985 | Barnet | 1 | 1 | Slight |
| Mon 8 Jul 1985 | Hertsmere | 2 | 1 | Slight |
| Wed 10 Jul 1985 | Three Rivers | 2 | 1 | Slight |
| Fri 12 Jul 1985 | Watford | 2 | 1 | Serious |
| Sun 14 Jul 1985 | Hertsmere | 2 | 1 | Slight |
| Mon 15 Jul 1985 | Watford | 2 | 1 | Slight |
| Tue 16 Jul 1985 | Watford | 2 | 1 | Slight |
| Wed 17 Jul 1985 | Watford | 1 | 1 | Serious |
| Fri 19 Jul 1985 | Watford | 2 | 1 | Slight |
| Sat 20 Jul 1985 | Hertsmere | 2 | 1 | Slight |
| Sat 20 Jul 1985 | Barnet | 2 | 1 | Slight |
| Wed 24 Jul 1985 | Watford | 2 | 1 | Slight |
| Wed 24 Jul 1985 | Barnet | 1 | 1 | Serious |
| Fri 26 Jul 1985 | Watford | 2 | 1 | Slight |
| Sat 27 Jul 1985 | Barnet | 2 | 1 | Slight |
| Sun 28 Jul 1985 | Watford | 2 | 1 | Serious |
| Mon 29 Jul 1985 | Hertsmere | 2 | 1 | Serious |
| Fri 2 Aug 1985 | Watford | 3 | 1 | Slight |
| Sun 4 Aug 1985 | Hertsmere | 2 | 1 | Slight |
| Mon 5 Aug 1985 | Watford | 2 | 1 | Slight |
| Tue 6 Aug 1985 | Hertsmere | 1 | 1 | Serious |
| Tue 13 Aug 1985 | Watford | 1 | 1 | Serious |
| Wed 14 Aug 1985 | Watford | 1 | 1 | Slight |
| Thu 22 Aug 1985 | Three Rivers | 2 | 1 | Slight |
| Wed 28 Aug 1985 | Barnet | 2 | 1 | Serious |
| Thu 29 Aug 1985 | Watford | 3 | 1 | Slight |
| Thu 29 Aug 1985 | Watford | 1 | 2 | Slight |
| Thu 29 Aug 1985 | Watford | 1 | 1 | Slight |
| Thu 29 Aug 1985 | Watford | 2 | 2 | Slight |
| Sat 31 Aug 1985 | Watford | 1 | 1 | Serious |
| Sat 31 Aug 1985 | Barnet | 2 | 1 | Slight |
| Fri 6 Sep 1985 | Three Rivers | 2 | 1 | Slight |
| Mon 9 Sep 1985 | Barnet | 1 | 1 | Slight |
| Mon 9 Sep 1985 | Watford | 2 | 1 | Slight |
| Tue 10 Sep 1985 | Watford | 2 | 2 | Slight |
| Wed 11 Sep 1985 | Watford | 2 | 1 | Slight |
| Thu 12 Sep 1985 | Hertsmere | 3 | 1 | Slight |
| Mon 16 Sep 1985 | Watford | 1 | 1 | Slight |
| Mon 16 Sep 1985 | Hertsmere | 2 | 1 | Slight |
| Tue 17 Sep 1985 | Watford | 1 | 1 | Serious |
| Wed 18 Sep 1985 | Watford | 2 | 1 | Slight |
| Fri 20 Sep 1985 | Hertsmere | 1 | 1 | Slight |
| Fri 20 Sep 1985 | Barnet | 2 | 1 | Slight |
| Sat 21 Sep 1985 | Watford | 1 | 1 | Slight |
| Sat 21 Sep 1985 | Barnet | 2 | 1 | Slight |
| Sun 22 Sep 1985 | Watford | 1 | 1 | Slight |
| Tue 1 Oct 1985 | Watford | 2 | 1 | Slight |
| Wed 2 Oct 1985 | Hertsmere | 2 | 1 | Serious |
| Thu 3 Oct 1985 | Three Rivers | 2 | 1 | Slight |
| Sat 5 Oct 1985 | Watford | 1 | 2 | Slight |
| Sun 6 Oct 1985 | Hertsmere | 1 | 1 | Slight |
| Sun 6 Oct 1985 | Barnet | 1 | 2 | Serious |
| Thu 10 Oct 1985 | Barnet | 2 | 1 | Slight |
| Fri 11 Oct 1985 | Hertsmere | 2 | 1 | Slight |
| Mon 14 Oct 1985 | Barnet | 2 | 3 | Serious |
| Tue 15 Oct 1985 | Hertsmere | 5 | 1 | Slight |
| Tue 15 Oct 1985 | Watford | 2 | 2 | Slight |
| Tue 22 Oct 1985 | Hertsmere | 1 | 2 | Slight |
| Thu 24 Oct 1985 | Barnet | 1 | 1 | Slight |
| Thu 24 Oct 1985 | Watford | 1 | 2 | Serious |
| Fri 25 Oct 1985 | Watford | 1 | 2 | Slight |
| Wed 30 Oct 1985 | Barnet | 1 | 1 | Slight |
| Thu 31 Oct 1985 | Barnet | 2 | 1 | Slight |
| Sun 3 Nov 1985 | Three Rivers | 3 | 1 | Slight |
| Thu 7 Nov 1985 | Watford | 2 | 1 | Slight |
| Sat 9 Nov 1985 | Hertsmere | 2 | 2 | Serious |
| Mon 11 Nov 1985 | Barnet | 1 | 1 | Serious |
| Tue 12 Nov 1985 | Barnet | 3 | 1 | Slight |
| Thu 14 Nov 1985 | Hertsmere | 2 | 1 | Slight |
| Sun 17 Nov 1985 | Barnet | 2 | 3 | Slight |
| Sun 17 Nov 1985 | Watford | 1 | 1 | Slight |
| Wed 20 Nov 1985 | Watford | 4 | 1 | Slight |
| Sat 23 Nov 1985 | Watford | 1 | 1 | Serious |
| Sat 23 Nov 1985 | Hertsmere | 1 | 1 | Serious |
| Sat 23 Nov 1985 | Hertsmere | 1 | 1 | Serious |
| Mon 25 Nov 1985 | Barnet | 1 | 1 | Slight |
| Tue 26 Nov 1985 | Hertsmere | 2 | 1 | Slight |
| Wed 27 Nov 1985 | Hertsmere | 2 | 1 | Slight |
| Wed 27 Nov 1985 | Barnet | 1 | 1 | Serious |
| Thu 28 Nov 1985 | Barnet | 1 | 1 | Slight |
| Sat 30 Nov 1985 | Hertsmere | 2 | 1 | Slight |
| Mon 2 Dec 1985 | Hertsmere | 1 | 1 | Slight |
| Tue 3 Dec 1985 | Watford | 1 | 1 | Serious |
| Thu 5 Dec 1985 | Watford | 3 | 1 | Slight |
| Fri 6 Dec 1985 | Watford | 1 | 1 | Serious |
| Fri 6 Dec 1985 | Three Rivers | 2 | 2 | Slight |
| Sat 7 Dec 1985 | Hertsmere | 2 | 2 | Slight |
| Tue 10 Dec 1985 | Watford | 2 | 1 | Slight |
| Tue 10 Dec 1985 | Barnet | 1 | 1 | Slight |
| Fri 13 Dec 1985 | Barnet | 3 | 1 | Slight |
| Tue 17 Dec 1985 | Barnet | 1 | 1 | Serious |
| Tue 17 Dec 1985 | Barnet | 4 | 1 | Slight |
| Tue 17 Dec 1985 | Hertsmere | 2 | 3 | Slight |
| Thu 19 Dec 1985 | Watford | 2 | 2 | Slight |
| Tue 24 Dec 1985 | Barnet | 2 | 1 | Slight |
| Tue 31 Dec 1985 | Watford | 2 | 1 | Slight |