Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Sun 13 Jan 1991 | North Hertfordshire | 2 | 2 | Slight |
| Thu 7 Feb 1991 | North Hertfordshire | 2 | 2 | Serious |
| Sun 17 Feb 1991 | North Hertfordshire | 3 | 3 | Serious |
| Sat 23 Feb 1991 | North Hertfordshire | 2 | 1 | Serious |
| Sat 16 Mar 1991 | North Hertfordshire | 2 | 1 | Slight |
| Fri 12 Apr 1991 | North Hertfordshire | 2 | 1 | Slight |
| Thu 2 May 1991 | North Hertfordshire | 1 | 2 | Serious |
| Thu 2 May 1991 | North Hertfordshire | 2 | 1 | Slight |
| Thu 16 May 1991 | North Hertfordshire | 1 | 2 | Serious |
| Sun 9 Jun 1991 | North Hertfordshire | 1 | 1 | Slight |
| Thu 20 Jun 1991 | North Hertfordshire | 3 | 1 | Slight |
| Wed 26 Jun 1991 | Welwyn Hatfield | 2 | 1 | Slight |
| Fri 12 Jul 1991 | North Hertfordshire | 3 | 1 | Slight |
| Sat 20 Jul 1991 | North Hertfordshire | 1 | 2 | Fatal |
| Sun 21 Jul 1991 | North Hertfordshire | 4 | 3 | Serious |
| Thu 1 Aug 1991 | Welwyn Hatfield | 2 | 1 | Slight |
| Sat 3 Aug 1991 | North Hertfordshire | 2 | 3 | Slight |
| Tue 6 Aug 1991 | North Hertfordshire | 2 | 1 | Slight |
| Sat 31 Aug 1991 | North Hertfordshire | 3 | 1 | Slight |
| Wed 11 Sep 1991 | North Hertfordshire | 4 | 2 | Serious |
| Tue 17 Sep 1991 | North Hertfordshire | 1 | 1 | Serious |
| Wed 25 Sep 1991 | North Hertfordshire | 2 | 1 | Slight |
| Thu 3 Oct 1991 | North Hertfordshire | 2 | 1 | Slight |
| Thu 3 Oct 1991 | North Hertfordshire | 2 | 1 | Slight |
| Sat 5 Oct 1991 | North Hertfordshire | 1 | 1 | Serious |
| Tue 15 Oct 1991 | North Hertfordshire | 3 | 2 | Slight |
| Fri 18 Oct 1991 | North Hertfordshire | 1 | 1 | Slight |
| Wed 30 Oct 1991 | North Hertfordshire | 1 | 1 | Serious |
| Fri 1 Nov 1991 | North Hertfordshire | 2 | 1 | Serious |
| Sat 23 Nov 1991 | North Hertfordshire | 1 | 1 | Slight |
| Tue 3 Dec 1991 | North Hertfordshire | 2 | 1 | Slight |
| Sun 22 Dec 1991 | North Hertfordshire | 1 | 1 | Slight |