Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Thu 3 Jan 1991 | Watford | 1 | 1 | Slight |
| Mon 7 Jan 1991 | Hertsmere | 2 | 1 | Slight |
| Mon 7 Jan 1991 | Watford | 2 | 1 | Slight |
| Tue 8 Jan 1991 | Barnet | 2 | 1 | Slight |
| Sun 13 Jan 1991 | Hertsmere | 2 | 2 | Serious |
| Mon 14 Jan 1991 | Watford | 2 | 1 | Slight |
| Wed 16 Jan 1991 | Watford | 1 | 1 | Slight |
| Wed 16 Jan 1991 | Hertsmere | 2 | 3 | Serious |
| Mon 21 Jan 1991 | Watford | 2 | 2 | Slight |
| Tue 22 Jan 1991 | Watford | 2 | 1 | Slight |
| Tue 22 Jan 1991 | Watford | 2 | 1 | Slight |
| Tue 22 Jan 1991 | Watford | 2 | 1 | Slight |
| Thu 24 Jan 1991 | Barnet | 1 | 1 | Serious |
| Wed 30 Jan 1991 | Barnet | 1 | 1 | Slight |
| Fri 1 Feb 1991 | Barnet | 2 | 1 | Slight |
| Thu 7 Feb 1991 | Watford | 2 | 2 | Slight |
| Fri 15 Feb 1991 | Barnet | 2 | 2 | Slight |
| Mon 18 Feb 1991 | Watford | 2 | 1 | Slight |
| Fri 22 Feb 1991 | Watford | 2 | 1 | Slight |
| Fri 22 Feb 1991 | Watford | 2 | 2 | Slight |
| Wed 27 Feb 1991 | Barnet | 1 | 1 | Slight |
| Wed 27 Feb 1991 | Barnet | 2 | 1 | Slight |
| Thu 28 Feb 1991 | Watford | 1 | 1 | Serious |
| Thu 28 Feb 1991 | Barnet | 1 | 2 | Serious |
| Fri 1 Mar 1991 | Hertsmere | 1 | 1 | Slight |
| Sat 2 Mar 1991 | Hertsmere | 2 | 1 | Slight |
| Wed 6 Mar 1991 | Hertsmere | 1 | 1 | Slight |
| Tue 26 Mar 1991 | Barnet | 2 | 1 | Serious |
| Wed 27 Mar 1991 | Watford | 2 | 1 | Slight |
| Thu 28 Mar 1991 | Barnet | 2 | 2 | Serious |
| Fri 29 Mar 1991 | Watford | 1 | 1 | Slight |
| Fri 29 Mar 1991 | Hertsmere | 2 | 1 | Slight |
| Wed 3 Apr 1991 | Watford | 2 | 1 | Slight |
| Sat 6 Apr 1991 | Hertsmere | 1 | 1 | Serious |
| Thu 11 Apr 1991 | Barnet | 2 | 1 | Slight |
| Thu 11 Apr 1991 | Barnet | 2 | 2 | Slight |
| Sat 13 Apr 1991 | Three Rivers | 2 | 1 | Serious |
| Sat 13 Apr 1991 | Watford | 1 | 1 | Slight |
| Mon 15 Apr 1991 | Watford | 2 | 2 | Slight |
| Wed 24 Apr 1991 | Barnet | 2 | 1 | Slight |
| Tue 30 Apr 1991 | Watford | 2 | 1 | Slight |
| Fri 3 May 1991 | Watford | 2 | 2 | Slight |
| Sun 12 May 1991 | Hertsmere | 1 | 1 | Slight |
| Wed 15 May 1991 | Barnet | 2 | 1 | Slight |
| Tue 21 May 1991 | Hertsmere | 1 | 1 | Slight |
| Fri 24 May 1991 | Barnet | 1 | 1 | Slight |
| Sat 25 May 1991 | Watford | 1 | 2 | Serious |
| Mon 27 May 1991 | Watford | 1 | 2 | Slight |
| Mon 27 May 1991 | Barnet | 2 | 1 | Slight |
| Mon 27 May 1991 | Hertsmere | 1 | 1 | Slight |
| Wed 29 May 1991 | Barnet | 2 | 1 | Slight |
| Fri 31 May 1991 | Hertsmere | 2 | 1 | Slight |
| Fri 31 May 1991 | Watford | 1 | 1 | Slight |
| Fri 31 May 1991 | Watford | 1 | 1 | Slight |
| Fri 31 May 1991 | Watford | 2 | 1 | Slight |
| Tue 4 Jun 1991 | Barnet | 2 | 1 | Serious |
| Wed 5 Jun 1991 | Barnet | 2 | 2 | Slight |
| Sun 9 Jun 1991 | Hertsmere | 2 | 6 | Serious |
| Mon 10 Jun 1991 | Watford | 1 | 1 | Slight |
| Wed 19 Jun 1991 | Hertsmere | 2 | 1 | Slight |
| Thu 20 Jun 1991 | Watford | 2 | 1 | Slight |
| Sat 22 Jun 1991 | Watford | 1 | 2 | Slight |
| Sat 22 Jun 1991 | Barnet | 2 | 1 | Slight |
| Tue 25 Jun 1991 | Barnet | 2 | 1 | Slight |
| Tue 25 Jun 1991 | Watford | 2 | 1 | Slight |
| Thu 27 Jun 1991 | Watford | 2 | 1 | Slight |
| Sat 29 Jun 1991 | Watford | 1 | 1 | Slight |
| Wed 3 Jul 1991 | Barnet | 1 | 1 | Slight |
| Wed 10 Jul 1991 | Barnet | 1 | 1 | Slight |
| Thu 11 Jul 1991 | Barnet | 2 | 1 | Slight |
| Fri 12 Jul 1991 | Hertsmere | 1 | 1 | Serious |
| Fri 12 Jul 1991 | Watford | 2 | 1 | Slight |
| Mon 15 Jul 1991 | Barnet | 2 | 1 | Serious |
| Thu 18 Jul 1991 | Barnet | 3 | 3 | Serious |
| Fri 19 Jul 1991 | Watford | 4 | 3 | Slight |
| Sat 20 Jul 1991 | Hertsmere | 2 | 2 | Slight |
| Mon 22 Jul 1991 | Barnet | 2 | 1 | Slight |
| Tue 23 Jul 1991 | Watford | 2 | 3 | Slight |
| Wed 24 Jul 1991 | Hertsmere | 1 | 1 | Slight |
| Wed 24 Jul 1991 | Hertsmere | 2 | 4 | Slight |
| Thu 25 Jul 1991 | Barnet | 1 | 1 | Slight |
| Sun 28 Jul 1991 | Watford | 1 | 1 | Slight |
| Sun 28 Jul 1991 | Watford | 1 | 1 | Slight |
| Wed 31 Jul 1991 | Watford | 5 | 2 | Slight |
| Fri 2 Aug 1991 | Watford | 2 | 1 | Slight |
| Sat 3 Aug 1991 | Watford | 2 | 2 | Slight |
| Mon 5 Aug 1991 | Watford | 2 | 1 | Serious |
| Thu 8 Aug 1991 | Barnet | 2 | 1 | Slight |
| Fri 9 Aug 1991 | Barnet | 2 | 1 | Slight |
| Thu 15 Aug 1991 | Barnet | 2 | 1 | Slight |
| Fri 16 Aug 1991 | Watford | 2 | 1 | Slight |
| Sun 18 Aug 1991 | Barnet | 2 | 1 | Slight |
| Fri 23 Aug 1991 | Hertsmere | 2 | 1 | Serious |
| Tue 27 Aug 1991 | Hertsmere | 2 | 1 | Slight |
| Thu 29 Aug 1991 | Barnet | 2 | 1 | Serious |
| Thu 29 Aug 1991 | Barnet | 1 | 1 | Serious |
| Fri 30 Aug 1991 | Barnet | 2 | 1 | Slight |
| Sat 31 Aug 1991 | Barnet | 2 | 3 | Slight |
| Wed 4 Sep 1991 | Hertsmere | 3 | 1 | Slight |
| Fri 6 Sep 1991 | Watford | 2 | 2 | Slight |
| Tue 10 Sep 1991 | Watford | 1 | 1 | Slight |
| Tue 10 Sep 1991 | Barnet | 2 | 1 | Slight |
| Tue 10 Sep 1991 | Barnet | 2 | 1 | Slight |
| Tue 10 Sep 1991 | Barnet | 2 | 1 | Slight |
| Fri 13 Sep 1991 | Hertsmere | 2 | 1 | Slight |
| Tue 17 Sep 1991 | Hertsmere | 2 | 1 | Slight |
| Thu 19 Sep 1991 | Hertsmere | 2 | 1 | Slight |
| Fri 20 Sep 1991 | Hertsmere | 3 | 1 | Slight |
| Fri 20 Sep 1991 | Watford | 1 | 1 | Serious |
| Fri 20 Sep 1991 | Barnet | 2 | 2 | Serious |
| Sat 21 Sep 1991 | Watford | 1 | 1 | Slight |
| Sun 22 Sep 1991 | Hertsmere | 1 | 2 | Slight |
| Tue 24 Sep 1991 | Hertsmere | 2 | 2 | Slight |
| Thu 26 Sep 1991 | Barnet | 1 | 1 | Slight |
| Thu 26 Sep 1991 | Watford | 2 | 1 | Slight |
| Thu 26 Sep 1991 | Watford | 2 | 1 | Slight |
| Fri 4 Oct 1991 | Barnet | 2 | 2 | Serious |
| Tue 8 Oct 1991 | Watford | 1 | 1 | Slight |
| Fri 11 Oct 1991 | Hertsmere | 2 | 1 | Serious |
| Mon 14 Oct 1991 | Barnet | 2 | 1 | Slight |
| Mon 14 Oct 1991 | Watford | 4 | 2 | Slight |
| Mon 14 Oct 1991 | Watford | 4 | 2 | Slight |
| Thu 17 Oct 1991 | Barnet | 1 | 1 | Slight |
| Sat 19 Oct 1991 | Barnet | 1 | 1 | Serious |
| Mon 21 Oct 1991 | Hertsmere | 2 | 1 | Slight |
| Mon 21 Oct 1991 | Hertsmere | 2 | 1 | Slight |
| Wed 23 Oct 1991 | Watford | 2 | 1 | Slight |
| Fri 25 Oct 1991 | Barnet | 1 | 1 | Slight |
| Sun 27 Oct 1991 | Hertsmere | 2 | 1 | Slight |
| Mon 28 Oct 1991 | Barnet | 1 | 1 | Serious |
| Fri 1 Nov 1991 | Barnet | 2 | 1 | Slight |
| Fri 1 Nov 1991 | Hertsmere | 1 | 1 | Serious |
| Fri 1 Nov 1991 | Hertsmere | 2 | 2 | Slight |
| Mon 4 Nov 1991 | Watford | 2 | 1 | Slight |
| Tue 5 Nov 1991 | Barnet | 2 | 1 | Serious |
| Thu 14 Nov 1991 | Watford | 1 | 1 | Slight |
| Mon 18 Nov 1991 | Watford | 1 | 1 | Slight |
| Tue 19 Nov 1991 | Watford | 2 | 1 | Serious |
| Thu 21 Nov 1991 | Barnet | 2 | 2 | Serious |
| Thu 21 Nov 1991 | Watford | 1 | 2 | Slight |
| Thu 21 Nov 1991 | Watford | 1 | 2 | Slight |
| Sat 23 Nov 1991 | Watford | 1 | 1 | Slight |
| Sun 24 Nov 1991 | Barnet | 3 | 3 | Slight |
| Mon 25 Nov 1991 | Watford | 1 | 1 | Serious |
| Mon 25 Nov 1991 | Watford | 1 | 1 | Serious |
| Wed 27 Nov 1991 | Hertsmere | 3 | 1 | Serious |
| Wed 27 Nov 1991 | Watford | 2 | 2 | Slight |
| Thu 28 Nov 1991 | Watford | 1 | 1 | Fatal |
| Sat 30 Nov 1991 | Watford | 1 | 3 | Fatal |
| Sun 1 Dec 1991 | Hertsmere | 1 | 1 | Slight |
| Sun 1 Dec 1991 | Watford | 2 | 1 | Slight |
| Tue 3 Dec 1991 | Watford | 1 | 2 | Slight |
| Thu 5 Dec 1991 | Watford | 2 | 1 | Slight |
| Sat 7 Dec 1991 | Watford | 1 | 1 | Slight |
| Sun 8 Dec 1991 | Barnet | 2 | 3 | Serious |
| Tue 10 Dec 1991 | Watford | 2 | 1 | Slight |
| Mon 16 Dec 1991 | Watford | 2 | 1 | Slight |
| Mon 23 Dec 1991 | Barnet | 1 | 5 | Serious |
| Sat 28 Dec 1991 | Watford | 2 | 1 | Slight |
| Tue 31 Dec 1991 | Hertsmere | 2 | 3 | Serious |