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