Fatal
Serious
Slight
Uncategorised
| Date | Local Authority | Vehicles | Casualties | Severity |
|---|---|---|---|---|
| Tue 9 Jan 1990 | Hertsmere | 1 | 1 | Serious |
| Fri 12 Jan 1990 | Hertsmere | 1 | 1 | Serious |
| Sun 14 Jan 1990 | Hertsmere | 2 | 1 | Slight |
| Mon 15 Jan 1990 | Hertsmere | 2 | 1 | Slight |
| Sun 28 Jan 1990 | Hertsmere | 2 | 3 | Serious |
| Fri 2 Feb 1990 | Hertsmere | 2 | 1 | Slight |
| Tue 6 Feb 1990 | St. Albans | 2 | 2 | Slight |
| Wed 7 Feb 1990 | Hertsmere | 2 | 4 | Serious |
| Sun 18 Feb 1990 | St. Albans | 2 | 1 | Slight |
| Sun 4 Mar 1990 | Hertsmere | 2 | 1 | Serious |
| Wed 14 Mar 1990 | Hertsmere | 1 | 1 | Slight |
| Sat 17 Mar 1990 | St. Albans | 2 | 1 | Slight |
| Thu 22 Mar 1990 | Hertsmere | 2 | 2 | Serious |
| Thu 5 Apr 1990 | Hertsmere | 2 | 1 | Slight |
| Mon 16 Apr 1990 | Hertsmere | 2 | 1 | Slight |
| Mon 23 Apr 1990 | Hertsmere | 1 | 1 | Slight |
| Thu 10 May 1990 | Hertsmere | 2 | 1 | Slight |
| Sat 26 May 1990 | Hertsmere | 1 | 2 | Serious |
| Sat 26 May 1990 | Hertsmere | 1 | 2 | Serious |
| Tue 29 May 1990 | Hertsmere | 1 | 1 | Slight |
| Fri 8 Jun 1990 | Hertsmere | 2 | 1 | Slight |
| Tue 12 Jun 1990 | Hertsmere | 2 | 1 | Serious |
| Fri 15 Jun 1990 | Hertsmere | 1 | 1 | Slight |
| Fri 6 Jul 1990 | Hertsmere | 2 | 2 | Serious |
| Sun 15 Jul 1990 | Hertsmere | 3 | 4 | Slight |
| Sat 21 Jul 1990 | Hertsmere | 1 | 1 | Serious |
| Tue 31 Jul 1990 | Hertsmere | 2 | 2 | Slight |
| Thu 30 Aug 1990 | Hertsmere | 2 | 2 | Slight |
| Mon 3 Sep 1990 | Hertsmere | 3 | 1 | Slight |
| Sun 9 Sep 1990 | Hertsmere | 2 | 1 | Slight |
| Wed 12 Sep 1990 | St. Albans | 3 | 1 | Slight |
| Mon 17 Sep 1990 | Hertsmere | 2 | 1 | Slight |
| Tue 18 Sep 1990 | Hertsmere | 3 | 1 | Serious |
| Thu 20 Sep 1990 | Hertsmere | 2 | 1 | Slight |
| Tue 2 Oct 1990 | Hertsmere | 1 | 1 | Serious |
| Wed 3 Oct 1990 | St. Albans | 2 | 1 | Slight |
| Tue 9 Oct 1990 | Hertsmere | 3 | 1 | Slight |
| Tue 16 Oct 1990 | Hertsmere | 2 | 2 | Serious |
| Fri 19 Oct 1990 | St. Albans | 2 | 1 | Slight |
| Mon 5 Nov 1990 | Hertsmere | 2 | 1 | Slight |
| Thu 15 Nov 1990 | St. Albans | 1 | 2 | Slight |
| Wed 21 Nov 1990 | Hertsmere | 2 | 2 | Slight |
| Mon 26 Nov 1990 | Hertsmere | 1 | 1 | Fatal |
| Tue 4 Dec 1990 | Hertsmere | 1 | 1 | Slight |
| Fri 7 Dec 1990 | Hertsmere | 1 | 1 | Slight |
| Sun 9 Dec 1990 | St. Albans | 2 | 1 | Slight |
| Wed 12 Dec 1990 | Hertsmere | 2 | 1 | Serious |